From be78b74fbdd00ab89b0827f7ddec91ac7e21aeb9 Mon Sep 17 00:00:00 2001
From: Slavi Pantaleev <slavi@devture.com>
Date: Sun, 5 Feb 2023 10:32:09 +0200
Subject: [PATCH] Switch from matrix-prometheus-postgres-exporter to an
 external prometheus_postgres_exporter role

---
 CHANGELOG.md                                  | 17 +++-
 ...configuring-playbook-prometheus-grafana.md |  8 +-
 ...onfiguring-playbook-prometheus-postgres.md | 10 +--
 group_vars/matrix_servers                     | 89 ++++++++++---------
 playbooks/matrix.yml                          |  2 +-
 requirements.yml                              |  3 +
 .../defaults/main.yml                         | 65 --------------
 .../tasks/main.yml                            | 29 ------
 .../tasks/setup_install.yml                   | 19 ----
 .../tasks/setup_uninstall.yml                 | 20 -----
 .../tasks/validate_config.yml                 |  9 --
 ...ix-prometheus-postgres-exporter.service.j2 | 42 ---------
 .../vars/main.yml                             |  5 --
 .../defaults/main.yml                         | 12 +++
 .../tasks/main.yml                            |  9 ++
 .../inject_into_nginx_proxy.yml               | 19 ++--
 .../defaults/main.yml                         |  3 +
 .../tasks/validate_config.yml                 | 16 ++++
 18 files changed, 123 insertions(+), 254 deletions(-)
 delete mode 100644 roles/custom/matrix-prometheus-postgres-exporter/defaults/main.yml
 delete mode 100644 roles/custom/matrix-prometheus-postgres-exporter/tasks/main.yml
 delete mode 100644 roles/custom/matrix-prometheus-postgres-exporter/tasks/setup_install.yml
 delete mode 100644 roles/custom/matrix-prometheus-postgres-exporter/tasks/setup_uninstall.yml
 delete mode 100644 roles/custom/matrix-prometheus-postgres-exporter/tasks/validate_config.yml
 delete mode 100644 roles/custom/matrix-prometheus-postgres-exporter/templates/systemd/matrix-prometheus-postgres-exporter.service.j2
 delete mode 100644 roles/custom/matrix-prometheus-postgres-exporter/vars/main.yml
 rename roles/custom/{matrix-prometheus-postgres-exporter/tasks => matrix-prometheus-services-proxy-connect/tasks/prometheus-postgres-exporter}/inject_into_nginx_proxy.yml (51%)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index edb4dba9c..bb62d8dd3 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,18 @@
+# 2023-02-05
+
+## The matrix-prometheus-postgres-exporter role lives independently now
+
+**TLDR**: the `matrix-prometheus-postgres-exporter` role is now included from another repository. Some variables have been renamed. All functionality remains intact.
+
+The `matrix-prometheus-postgres-exporter` role (which configures [Prometheus Postgres Exporter](https://github.com/prometheus-community/postgres_exporter)) has been extracted from the playbook and now lives in its own repository at https://gitlab.com/etke.cc/roles/prometheus_postgres_exporter.
+
+It's still part of the playbook, but is now installed via `ansible-galaxy` (by running `just roles` / `make roles`). Some variables have been renamed (`matrix_prometheus_postgres_exporter_` -> `prometheus_postgres_exporter_`, etc.). The playbook will report all variables that you need to rename to get upgraded. All functionality remains intact.
+
+The `matrix-prometheus-services-proxy-connect` role has bee adjusted to help integrate the new `prometheus_postgres_exporter` role with our own services (`matrix-nginx-proxy`)
+
+Other roles which aren't strictly related to Matrix are likely to follow this fate of moving to their own repositories. Extracting them out allows other Ansible playbooks to make use of these roles easily.
+
+
 # 2023-01-26
 
 ## Coturn can now use host-networking
@@ -519,7 +534,7 @@ See our [Setting up the ntfy push notifications server](docs/configuring-playboo
 
 **If you're using node-exporter** (`matrix_prometheus_node_exporter_enabled: true`) and would like to collect its metrics from an external Prometheus server, see `matrix_prometheus_node_exporter_metrics_proxying_enabled` described in our [Collecting metrics to an external Prometheus server](docs/configuring-playbook-prometheus-grafana.md#collecting-metrics-to-an-external-prometheus-server) documentation. You will be able to collect its metrics from `https://matrix.DOMAIN/metrics/node-exporter`.
 
-**If you're using [postgres-exporter](docs/configuring-playbook-prometheus-postgres.md)** (`matrix_prometheus_postgres_exporter_enabled: true`) and would like to collect its metrics from an external Prometheus server, see `matrix_prometheus_postgres_exporter_metrics_proxying_enabled` described in our [Collecting metrics to an external Prometheus server](docs/configuring-playbook-prometheus-grafana.md#collecting-metrics-to-an-external-prometheus-server) documentation. You will be able to collect its metrics from `https://matrix.DOMAIN/metrics/postgres-exporter`.
+**If you're using [postgres-exporter](docs/configuring-playbook-prometheus-postgres.md)** (`prometheus_postgres_exporter_enabled: true`) and would like to collect its metrics from an external Prometheus server, see `matrix_prometheus_services_proxy_connect_prometheus_postgres_exporter_metrics_proxying_enabled` described in our [Collecting metrics to an external Prometheus server](docs/configuring-playbook-prometheus-grafana.md#collecting-metrics-to-an-external-prometheus-server) documentation. You will be able to collect its metrics from `https://matrix.DOMAIN/metrics/postgres-exporter`.
 
 **If you're using Synapse** and would like to collect its metrics from an external Prometheus server, you may find that:
 
diff --git a/docs/configuring-playbook-prometheus-grafana.md b/docs/configuring-playbook-prometheus-grafana.md
index 703c03b22..956b05736 100644
--- a/docs/configuring-playbook-prometheus-grafana.md
+++ b/docs/configuring-playbook-prometheus-grafana.md
@@ -13,7 +13,7 @@ matrix_prometheus_enabled: true
 prometheus_node_exporter_enabled: true
 
 # You can remove this, if unnecessary.
-matrix_prometheus_postgres_exporter_enabled: true
+prometheus_postgres_exporter_enabled: true
 
 # You can remove this, if unnecessary.
 matrix_prometheus_nginxlog_exporter_enabled: true
@@ -41,7 +41,7 @@ Name | Description
 -----|----------
 `matrix_prometheus_enabled`|[Prometheus](https://prometheus.io) is a time series database. It holds all the data we're going to talk about.
 `prometheus_node_exporter_enabled`|[Node Exporter](https://prometheus.io/docs/guides/node-exporter/) is an addon of sorts to Prometheus that collects generic system information such as CPU, memory, filesystem, and even system temperatures
-`matrix_prometheus_postgres_exporter_enabled`|[Postgres Exporter](configuring-playbook-prometheus-postgres.md) is an addon of sorts to expose Postgres database metrics to Prometheus.
+`prometheus_postgres_exporter_enabled`|[Postgres Exporter](configuring-playbook-prometheus-postgres.md) is an addon of sorts to expose Postgres database metrics to Prometheus.
 `matrix_prometheus_nginxlog_exporter_enabled`|[NGINX Log Exporter](configuring-playbook-prometheus-nginxlog.md) is an addon of sorts to expose NGINX logs to Prometheus.
 `matrix_grafana_enabled`|[Grafana](https://grafana.com/) is the visual component. It shows (on the `stats.<your-domain>` subdomain) the dashboards with the graphs that we're interested in
 `matrix_grafana_anonymous_access`|By default you need to log in to see graphs. If you want to publicly share your graphs (e.g. when asking for help in [`#synapse:matrix.org`](https://matrix.to/#/#synapse:matrix.org?via=matrix.org&via=privacytools.io&via=mozilla.org)) you'll want to enable this option.
@@ -76,9 +76,9 @@ Name | Description
 `matrix_synapse_metrics_proxying_enabled`|Set this to `true` to expose Synapse's metrics on `https://matrix.DOMAIN/metrics/synapse/main-process` and `https://matrix.DOMAIN/metrics/synapse/worker/TYPE-ID` (only takes effect if `matrix_nginx_proxy_proxy_matrix_metrics_enabled: true`). Read [below](#collecting-synapse-worker-metrics-to-an-external-prometheus-server) if you're running a Synapse worker setup (`matrix_synapse_workers_enabled: true`).
 `prometheus_node_exporter_enabled`|Set this to `true` to enable the node (general system stats) exporter (locally, on the container network)
 `matrix_prometheus_services_proxy_connect_prometheus_node_exporter_metrics_proxying_enabled`|Set this to `true` to expose the node (general system stats) metrics on `https://matrix.DOMAIN/metrics/node-exporter` (only takes effect if `matrix_nginx_proxy_proxy_matrix_metrics_enabled: true`)
-`matrix_prometheus_postgres_exporter_enabled`|Set this to `true` to enable the [Postgres exporter](configuring-playbook-prometheus-postgres.md) (locally, on the container network)
+`prometheus_postgres_exporter_enabled`|Set this to `true` to enable the [Postgres exporter](configuring-playbook-prometheus-postgres.md) (locally, on the container network)
 `matrix_prometheus_nginxlog_exporter_enabled`|Set this to `true` to enable the [NGINX Log exporter](configuring-playbook-prometheus-nginxlog.md) (locally, on the container network)
-`matrix_prometheus_postgres_exporter_metrics_proxying_enabled`|Set this to `true` to expose the [Postgres exporter](configuring-playbook-prometheus-postgres.md) metrics on `https://matrix.DOMAIN/metrics/postgres-exporter` (only takes effect if `matrix_nginx_proxy_proxy_matrix_metrics_enabled: true`)
+`matrix_prometheus_services_proxy_connect_prometheus_postgres_exporter_metrics_proxying_enabled`|Set this to `true` to expose the [Postgres exporter](configuring-playbook-prometheus-postgres.md) metrics on `https://matrix.DOMAIN/metrics/postgres-exporter` (only takes effect if `matrix_nginx_proxy_proxy_matrix_metrics_enabled: true`)
 `matrix_bridge_hookshot_metrics_enabled`|Set this to `true` to make [Hookshot](configuring-playbook-bridge-hookshot.md) expose metrics (locally, on the container network)
 `matrix_bridge_hookshot_metrics_proxying_enabled`|Set this to `true` to expose the [Hookshot](configuring-playbook-bridge-hookshot.md) metrics on `https://matrix.DOMAIN/metrics/hookshot` (only takes effect if `matrix_nginx_proxy_proxy_matrix_metrics_enabled: true`)
 `matrix_SERVICE_metrics_proxying_enabled`|Various other services/roles may provide similar `_metrics_enabled` and `_metrics_proxying_enabled` variables for exposing their metrics. Refer to each role for details. Only takes effect if `matrix_nginx_proxy_proxy_matrix_metrics_enabled: true`
diff --git a/docs/configuring-playbook-prometheus-postgres.md b/docs/configuring-playbook-prometheus-postgres.md
index 6fd13a9e9..c3c8e0bfb 100644
--- a/docs/configuring-playbook-prometheus-postgres.md
+++ b/docs/configuring-playbook-prometheus-postgres.md
@@ -6,17 +6,17 @@ You can enable this with the following settings in your configuration file (`inv
 
 
 ```yaml
-matrix_prometheus_postgres_exporter_enabled: true
+prometheus_postgres_exporter_enabled: true
 ```
 
 ## What does it do?
 
 Name | Description
 -----|----------
-`matrix_prometheus_postgres_exporter_enabled`|Enable the postgres prometheus exporter. This sets up the docker container, connects it to the database and adds a 'job' to the prometheus config which tells prometheus about this new exporter. The default is 'false'
-`matrix_prometheus_postgres_exporter_database_username`| The 'username' for the user that the exporter uses to connect to the database. The default is 'matrix_prometheus_postgres_exporter'
-`matrix_prometheus_postgres_exporter_database_password`| The 'password' for the user that the exporter uses to connect to the database. By default, this is auto-generated by the playbook
-`matrix_prometheus_postgres_exporter_metrics_proxying_enabled`|If set to `true`, exposes the Postgres exporter metrics on `https://matrix.DOMAIN/metrics/postgres-exporter` for usage with an [external Prometheus server](configuring-playbook-prometheus-grafana.md#collecting-metrics-to-an-external-prometheus-server) (only takes effect if `matrix_nginx_proxy_proxy_matrix_metrics_enabled: true`)
+`prometheus_postgres_exporter_enabled`|Enable the postgres prometheus exporter. This sets up the docker container, connects it to the database and adds a 'job' to the prometheus config which tells prometheus about this new exporter. The default is 'false'
+`prometheus_postgres_exporter_database_username`| The 'username' for the user that the exporter uses to connect to the database. The default is 'matrix_prometheus_postgres_exporter'
+`prometheus_postgres_exporter_database_password`| The 'password' for the user that the exporter uses to connect to the database. By default, this is auto-generated by the playbook
+`matrix_prometheus_services_proxy_connect_prometheus_postgres_exporter_metrics_proxying_enabled`|If set to `true`, exposes the Postgres exporter metrics on `https://matrix.DOMAIN/metrics/postgres-exporter` for usage with an [external Prometheus server](configuring-playbook-prometheus-grafana.md#collecting-metrics-to-an-external-prometheus-server) (only takes effect if `matrix_nginx_proxy_proxy_matrix_metrics_enabled: true`)
 
 
 ## More information
diff --git a/group_vars/matrix_servers b/group_vars/matrix_servers
index 2a8b24430..6d096dea0 100755
--- a/group_vars/matrix_servers
+++ b/group_vars/matrix_servers
@@ -301,11 +301,11 @@ devture_systemd_service_manager_services_list_auto: |
     +
     ([{'name': 'matrix-prometheus.service', 'priority': 4000, 'groups': ['matrix', 'monitoring', 'prometheus', 'prometheus-core']}] if matrix_prometheus_enabled else [])
     +
-    ([{'name': (prometheus_node_exporter_identifier + '.service'), 'priority': 3900, 'groups': ['matrix', 'monitoring', 'prometheus', 'prometheus-node-exporters']}] if prometheus_node_exporter_enabled else [])
+    ([{'name': (prometheus_node_exporter_identifier + '.service'), 'priority': 3900, 'groups': ['matrix', 'monitoring', 'prometheus', 'prometheus-exporters']}] if prometheus_node_exporter_enabled else [])
     +
-    ([{'name': 'matrix-prometheus-postgres-exporter.service', 'priority': 3900, 'groups': ['matrix', 'monitoring', 'prometheus', 'prometheus-node-exporters']}] if matrix_prometheus_postgres_exporter_enabled else [])
+    ([{'name': (prometheus_postgres_exporter_identifier + '.service'), 'priority': 3900, 'groups': ['matrix', 'monitoring', 'prometheus', 'prometheus-exporters']}] if prometheus_postgres_exporter_enabled else [])
     +
-    ([{'name': 'matrix-prometheus-nginxlog-exporter.service', 'priority': 3900, 'groups': ['matrix', 'monitoring', 'prometheus', 'prometheus-node-exporters']}] if matrix_prometheus_nginxlog_exporter_enabled else [])
+    ([{'name': 'matrix-prometheus-nginxlog-exporter.service', 'priority': 3900, 'groups': ['matrix', 'monitoring', 'prometheus', 'prometheus-exporters']}] if matrix_prometheus_nginxlog_exporter_enabled else [])
     +
     ([{'name': 'matrix-redis', 'priority': 750, 'groups': ['matrix', 'redis']}] if matrix_redis_enabled else [])
     +
@@ -2589,10 +2589,10 @@ devture_postgres_managed_databases_auto: |
     }] if (matrix_etherpad_enabled and matrix_etherpad_database_engine == 'postgres' and matrix_etherpad_database_hostname == devture_postgres_connection_hostname) else [])
     +
     ([{
-      'name': matrix_prometheus_postgres_exporter_database_name,
-      'username': matrix_prometheus_postgres_exporter_database_username,
-      'password': matrix_prometheus_postgres_exporter_database_password,
-    }] if (matrix_prometheus_postgres_exporter_enabled and matrix_prometheus_postgres_exporter_database_hostname == devture_postgres_connection_hostname) else [])
+      'name': prometheus_postgres_exporter_database_name,
+      'username': prometheus_postgres_exporter_database_username,
+      'password': prometheus_postgres_exporter_database_password,
+    }] if (prometheus_postgres_exporter_enabled and prometheus_postgres_exporter_database_hostname == devture_postgres_connection_hostname) else [])
 
    }}
 
@@ -2976,6 +2976,45 @@ prometheus_node_exporter_container_labels_traefik_enabled: false
 #
 ######################################################################
 
+######################################################################
+#
+# etke/prometheus_postgres_exporter
+#
+######################################################################
+
+prometheus_postgres_exporter_enabled: false
+
+prometheus_postgres_exporter_identifier: matrix-prometheus-postgres-exporter
+
+prometheus_postgres_exporter_base_path: "{{ matrix_base_data_path }}/prometheus-postgres-exporter"
+
+prometheus_postgres_exporter_uid: "{{ matrix_user_uid }}"
+prometheus_postgres_exporter_gid: "{{ matrix_user_gid }}"
+
+prometheus_postgres_exporter_server_fqn: "{{ matrix_server_fqn_matrix }}"
+
+prometheus_postgres_exporter_container_network: "{{ matrix_docker_network }}"
+
+prometheus_postgres_exporter_container_labels_traefik_enabled: false
+
+prometheus_postgres_exporter_database_hostname: "{{ devture_postgres_connection_hostname if devture_postgres_enabled else '' }}"
+prometheus_postgres_exporter_database_username: matrix_prometheus_postgres_exporter
+prometheus_postgres_exporter_database_password: "{{ '%s' | format(matrix_homeserver_generic_secret_key) | password_hash('sha512', 'prometheus.pg.db', rounds=655555) | to_uuid }}"
+prometheus_postgres_exporter_database_name: matrix_prometheus_postgres_exporter
+
+prometheus_postgres_exporter_systemd_required_services_list: |
+  {{
+    ['docker.service']
+    +
+    ([devture_postgres_identifier ~ '.service'] if devture_postgres_enabled else [])
+  }}
+
+######################################################################
+#
+# /etke/prometheus_postgres_exporter
+#
+######################################################################
+
 ######################################################################
 #
 # matrix-prometheus-nginxlog-exporter
@@ -3011,8 +3050,8 @@ matrix_prometheus_scraper_synapse_rules_synapse_tag: "{{ matrix_synapse_docker_i
 matrix_prometheus_scraper_node_enabled: "{{ prometheus_node_exporter_enabled }}"
 matrix_prometheus_scraper_node_targets: "{{ [prometheus_node_exporter_identifier + ':9100'] if prometheus_node_exporter_enabled else [] }}"
 
-matrix_prometheus_scraper_postgres_enabled: "{{ matrix_prometheus_postgres_exporter_enabled }}"
-matrix_prometheus_scraper_postgres_targets: "{{ ['matrix-prometheus-postgres-exporter:'+ matrix_prometheus_postgres_exporter_port | string] if matrix_prometheus_scraper_postgres_enabled else [] }}"
+matrix_prometheus_scraper_postgres_enabled: "{{ prometheus_postgres_exporter_enabled }}"
+matrix_prometheus_scraper_postgres_targets: "{{ [prometheus_postgres_exporter_identifier + ':' + prometheus_postgres_exporter_port | string] if matrix_prometheus_scraper_postgres_enabled else [] }}"
 
 matrix_prometheus_scraper_hookshot_enabled: "{{ matrix_hookshot_metrics_enabled|default(false) }}"
 matrix_prometheus_scraper_hookshot_targets: "{{ [matrix_hookshot_container_url | string +':'+ matrix_hookshot_metrics_port | string] if matrix_hookshot_metrics_enabled else [] }}"
@@ -3027,29 +3066,6 @@ matrix_prometheus_scraper_nginxlog_server_port: "{{ (matrix_prometheus_nginxlog_
 #
 ######################################################################
 
-######################################################################
-#
-# matrix-prometheus-postgres-exporter
-#
-######################################################################
-
-matrix_prometheus_postgres_exporter_enabled: false
-matrix_prometheus_postgres_exporter_database_hostname: "{{ devture_postgres_connection_hostname if devture_postgres_enabled else '' }}"
-matrix_prometheus_postgres_exporter_database_password: "{{ '%s' | format(matrix_homeserver_generic_secret_key) | password_hash('sha512', 'prometheus.pg.db', rounds=655555) | to_uuid }}"
-
-matrix_prometheus_postgres_exporter_systemd_required_services_list: |
-  {{
-    ['docker.service']
-    +
-    ([devture_postgres_identifier ~ '.service'] if devture_postgres_enabled else [])
-  }}
-
-######################################################################
-#
-# /matrix-prometheus-postgres-exporter
-#
-######################################################################
-
 ######################################################################
 #
 # matrix-grafana
@@ -3069,7 +3085,7 @@ matrix_grafana_dashboard_download_urls: |
     +
     (prometheus_node_exporter_dashboard_urls if prometheus_node_exporter_enabled else [])
     +
-    (matrix_prometheus_postgres_exporter_dashboard_urls if matrix_prometheus_postgres_exporter_enabled else [])
+    (prometheus_postgres_exporter_dashboard_urls if prometheus_postgres_exporter_enabled else [])
     +
     (matrix_prometheus_nginxlog_exporter_dashboard_urls if matrix_prometheus_nginxlog_exporter_enabled else [])
   }}
@@ -3083,13 +3099,6 @@ matrix_grafana_default_home_dashboard_path: |-
     }[matrix_homeserver_implementation]
   }}
 
-matrix_grafana_systemd_wanted_services_list: |
-  {{
-    []
-    +
-    (['matrix-prometheus-postgres-exporter.service'] if matrix_prometheus_postgres_exporter_enabled else [])
-  }}
-
 ######################################################################
 #
 # /matrix-grafana
diff --git a/playbooks/matrix.yml b/playbooks/matrix.yml
index 5190521e2..7be0d6295 100755
--- a/playbooks/matrix.yml
+++ b/playbooks/matrix.yml
@@ -87,7 +87,7 @@
     - custom/matrix-conduit
     - custom/matrix-synapse-admin
     - galaxy/prometheus_node_exporter
-    - custom/matrix-prometheus-postgres-exporter
+    - galaxy/prometheus_postgres_exporter
     - custom/matrix-prometheus-nginxlog-exporter
     - custom/matrix-prometheus
     - custom/matrix-grafana
diff --git a/requirements.yml b/requirements.yml
index 8ffa99d53..69b09cac5 100644
--- a/requirements.yml
+++ b/requirements.yml
@@ -32,3 +32,6 @@
 
 - src: git+https://gitlab.com/etke.cc/roles/prometheus_node_exporter.git
   version: v1.5.0-1
+
+- src: git+https://gitlab.com/etke.cc/roles/prometheus_postgres_exporter.git
+  version: v0.11.1-0
diff --git a/roles/custom/matrix-prometheus-postgres-exporter/defaults/main.yml b/roles/custom/matrix-prometheus-postgres-exporter/defaults/main.yml
deleted file mode 100644
index 78481a32b..000000000
--- a/roles/custom/matrix-prometheus-postgres-exporter/defaults/main.yml
+++ /dev/null
@@ -1,65 +0,0 @@
----
-# matrix-prometheus-postgres-exporter is an Prometheus exporter for postgres metrics
-# Project source code URL: https://github.com/prometheus-community/postgres_exporter
-
-matrix_prometheus_postgres_exporter_enabled: false
-
-matrix_prometheus_postgres_exporter_version: v0.11.1
-matrix_prometheus_postgres_exporter_port: 9187
-
-matrix_prometheus_postgres_exporter_docker_image: "{{ matrix_prometheus_postgres_exporter_docker_image_name_prefix }}prometheuscommunity/postgres-exporter:{{ matrix_prometheus_postgres_exporter_version }}"
-matrix_prometheus_postgres_exporter_docker_image_name_prefix: "quay.io/"
-matrix_prometheus_postgres_exporter_docker_image_force_pull: "{{ matrix_prometheus_postgres_exporter_docker_image.endswith(':latest') }}"
-
-# A list of extra arguments to pass to the container
-matrix_prometheus_postgres_exporter_container_extra_arguments: ["-e PG_EXPORTER_AUTO_DISCOVER_DATABASES=true",
-                                                                "-e PG_EXPORTER_WEB_LISTEN_ADDRESS=\":{{ matrix_prometheus_postgres_exporter_port }}\"",
-                                                                "-e DATA_SOURCE_NAME=\"postgresql://{{ matrix_prometheus_postgres_exporter_database_username }}:{{ matrix_prometheus_postgres_exporter_database_password }}@{{ matrix_prometheus_postgres_exporter_database_hostname }}:5432/{{ matrix_prometheus_postgres_exporter_database_name }}?sslmode=disable\""]
-
-# List of systemd services that matrix-prometheus-postgres-exporter.service depends on
-matrix_prometheus_postgres_exporter_systemd_required_services_list: ['docker.service']
-
-# List of systemd services that matrix-prometheus-postgres-exporter.service wants
-matrix_prometheus_postgres_exporter_systemd_wanted_services_list: []
-
-# details for connecting to the database
-matrix_prometheus_postgres_exporter_database_username: 'matrix_prometheus_postgres_exporter'
-matrix_prometheus_postgres_exporter_database_password: 'some-password'
-matrix_prometheus_postgres_exporter_database_hostname: ''
-matrix_prometheus_postgres_exporter_database_port: 5432
-matrix_prometheus_postgres_exporter_database_name: 'matrix_prometheus_postgres_exporter'
-
-# Controls whether postgres-exporter metrics should be proxied (exposed) on `matrix.DOMAIN/metrics/postgres-exporter`.
-# This will only work take effect if `matrix_nginx_proxy_proxy_matrix_metrics_enabled: true`.
-# See the `matrix-nginx-proxy` role for details about enabling `matrix_nginx_proxy_proxy_matrix_metrics_enabled`.
-matrix_prometheus_postgres_exporter_metrics_proxying_enabled: false
-
-# Controls whether the matrix-prometheus container exposes its HTTP port (tcp/9187 in the container).
-#
-# Takes an "<ip>:<port>" value (e.g. "127.0.0.1:9187"), just a port number or an empty string to not expose.
-#
-# You likely don't need to do this. See `matrix_prometheus_postgres_exporter_metrics_proxying_enabled`.
-#
-# Official recommendations are to run this container with `--net=host`,
-# but we don't do that, since it:
-# - likely exposes the metrics web server way too publicly (before applying https://github.com/spantaleev/matrix-docker-ansible-deploy/pull/1008)
-# - or listens on a loopback interface only (--net=host and 127.0.0.1:9187), which is not reachable from another container (like `matrix-prometheus`)
-#
-# Using `--net=host` and binding to Docker's `matrix` bridge network may be a solution to both,
-# but that's trickier to accomplish and won't necessarily work (hasn't been tested).
-#
-# Not using `--net=host` means that our network statistic reports are likely broken (inaccurate),
-# because node-exporter can't see all interfaces, etc.
-# For now, we'll live with that, until someone develops a better solution.
-matrix_prometheus_postgres_exporter_container_http_host_bind_port: ''
-
-# If you are supplying your own NGINX proxy but want to use the provided exporters you will have to supply an "<ip>:<port>" value for the containers to bind to on your host.
-# If matrix_prometheus_postgres_exporter_container_http_host_bind_port is set to just a port number, this will default to "127.0.0.1:<port>"
-# If matrix_prometheus_postgres_exporter_container_http_host_bind_port is set to an IP that is not  0.0.0.0 and a port, that "<ip>:<port>" value will be used
-# Otherwise this value will be empty and you will have to manually configure your NGINX config file. (If you are using the config files generated by this playbook, you will have to edit matrix-domain.conf)
-matrix_prometheus_postgres_exporter_matrix_nginx_proxy_not_enabled_proxy_pass_host: "{{ '127.0.0.1' + matrix_prometheus_postgres_exporter_container_http_host_bind_port_number_raw if not ':' in matrix_prometheus_postgres_exporter_container_http_host_bind_port else (matrix_prometheus_postgres_exporter_container_http_host_bind_port if matrix_prometheus_postgres_exporter_container_http_host_bind_port.split(':')[0] != '0.0.0.0' else '') }}"
-
-# matrix_prometheus_postgres_exporter_dashboard_urls contains a list of URLs with Grafana dashboard definitions.
-# If the Grafana role is enabled, these dashboards will be downloaded.
-matrix_prometheus_postgres_exporter_dashboard_urls:
-  - "https://grafana.com/api/dashboards/9628/revisions/7/download"
diff --git a/roles/custom/matrix-prometheus-postgres-exporter/tasks/main.yml b/roles/custom/matrix-prometheus-postgres-exporter/tasks/main.yml
deleted file mode 100644
index 7ff6d15ae..000000000
--- a/roles/custom/matrix-prometheus-postgres-exporter/tasks/main.yml
+++ /dev/null
@@ -1,29 +0,0 @@
----
-
-- block:
-    - when: matrix_prometheus_postgres_exporter_enabled | bool and matrix_prometheus_postgres_exporter_metrics_proxying_enabled | bool
-      ansible.builtin.include_tasks: "{{ role_path }}/tasks/inject_into_nginx_proxy.yml"
-  tags:
-    - setup-all
-    - setup-nginx-proxy
-    - install-all
-    - install-nginx-proxy
-
-- block:
-    - when: matrix_prometheus_postgres_exporter_enabled | bool
-      ansible.builtin.include_tasks: "{{ role_path }}/tasks/validate_config.yml"
-
-    - when: matrix_prometheus_postgres_exporter_enabled | bool
-      ansible.builtin.include_tasks: "{{ role_path }}/tasks/setup_install.yml"
-  tags:
-    - setup-all
-    - setup-prometheus-postgres-exporter
-    - install-all
-    - install-prometheus-postgres-exporter
-
-- block:
-    - when: not matrix_prometheus_postgres_exporter_enabled | bool
-      ansible.builtin.include_tasks: "{{ role_path }}/tasks/setup_uninstall.yml"
-  tags:
-    - setup-all
-    - setup-prometheus-postgres-exporter
diff --git a/roles/custom/matrix-prometheus-postgres-exporter/tasks/setup_install.yml b/roles/custom/matrix-prometheus-postgres-exporter/tasks/setup_install.yml
deleted file mode 100644
index ee0f9bef7..000000000
--- a/roles/custom/matrix-prometheus-postgres-exporter/tasks/setup_install.yml
+++ /dev/null
@@ -1,19 +0,0 @@
----
-
-- name: Ensure matrix-prometheus-postgres-exporter image is pulled
-  community.docker.docker_image:
-    name: "{{ matrix_prometheus_postgres_exporter_docker_image }}"
-    source: "{{ 'pull' if ansible_version.major > 2 or ansible_version.minor > 7 else omit }}"
-    force_source: "{{ matrix_prometheus_postgres_exporter_docker_image_force_pull if ansible_version.major > 2 or ansible_version.minor >= 8 else omit }}"
-    force: "{{ omit if ansible_version.major > 2 or ansible_version.minor >= 8 else matrix_prometheus_postgres_exporter_docker_image_force_pull }}"
-  register: result
-  retries: "{{ devture_playbook_help_container_retries_count }}"
-  delay: "{{ devture_playbook_help_container_retries_delay }}"
-  until: result is not failed
-
-- name: Ensure matrix-prometheus-postgres-exporter.service installed
-  ansible.builtin.template:
-    src: "{{ role_path }}/templates/systemd/matrix-prometheus-postgres-exporter.service.j2"
-    dest: "{{ devture_systemd_docker_base_systemd_path }}/matrix-prometheus-postgres-exporter.service"
-    mode: 0644
-  register: matrix_prometheus_postgres_exporter_systemd_service_result
diff --git a/roles/custom/matrix-prometheus-postgres-exporter/tasks/setup_uninstall.yml b/roles/custom/matrix-prometheus-postgres-exporter/tasks/setup_uninstall.yml
deleted file mode 100644
index bdf720428..000000000
--- a/roles/custom/matrix-prometheus-postgres-exporter/tasks/setup_uninstall.yml
+++ /dev/null
@@ -1,20 +0,0 @@
----
-
-- name: Check existence of matrix-prometheus-postgres-exporter service
-  ansible.builtin.stat:
-    path: "{{ devture_systemd_docker_base_systemd_path }}/matrix-prometheus-postgres-exporter.service"
-  register: matrix_prometheus_postgres_exporter_service_stat
-
-- when: matrix_prometheus_postgres_exporter_service_stat.stat.exists | bool
-  block:
-    - name: Ensure matrix-prometheus-postgres-exporter is stopped
-      ansible.builtin.service:
-        name: matrix-prometheus-postgres-exporter
-        state: stopped
-        enabled: false
-        daemon_reload: true
-
-    - name: Ensure matrix-prometheus-postgres-exporter.service doesn't exist
-      ansible.builtin.file:
-        path: "{{ devture_systemd_docker_base_systemd_path }}/matrix-prometheus-postgres-exporter.service"
-        state: absent
diff --git a/roles/custom/matrix-prometheus-postgres-exporter/tasks/validate_config.yml b/roles/custom/matrix-prometheus-postgres-exporter/tasks/validate_config.yml
deleted file mode 100644
index 6acf784f2..000000000
--- a/roles/custom/matrix-prometheus-postgres-exporter/tasks/validate_config.yml
+++ /dev/null
@@ -1,9 +0,0 @@
----
-
-- name: Fail if required prometheus-postgres-exporter settings not defined
-  ansible.builtin.fail:
-    msg: >
-      You need to define a required configuration setting (`{{ item }}`).
-  when: "vars[item] == ''"
-  with_items:
-    - matrix_prometheus_postgres_exporter_database_hostname
diff --git a/roles/custom/matrix-prometheus-postgres-exporter/templates/systemd/matrix-prometheus-postgres-exporter.service.j2 b/roles/custom/matrix-prometheus-postgres-exporter/templates/systemd/matrix-prometheus-postgres-exporter.service.j2
deleted file mode 100644
index 5c3fbac6f..000000000
--- a/roles/custom/matrix-prometheus-postgres-exporter/templates/systemd/matrix-prometheus-postgres-exporter.service.j2
+++ /dev/null
@@ -1,42 +0,0 @@
-#jinja2: lstrip_blocks: "True"
-[Unit]
-Description=matrix-prometheus-postgres-exporter
-{% for service in matrix_prometheus_postgres_exporter_systemd_required_services_list %}
-Requires={{ service }}
-After={{ service }}
-{% endfor %}
-{% for service in matrix_prometheus_postgres_exporter_systemd_wanted_services_list %}
-Wants={{ service }}
-{% endfor %}
-DefaultDependencies=no
-
-[Service]
-Type=simple
-Environment="HOME={{ devture_systemd_docker_base_systemd_unit_home_path }}"
-ExecStartPre=-{{ devture_systemd_docker_base_host_command_sh }} -c '{{ devture_systemd_docker_base_host_command_docker }} kill matrix-prometheus-postgres-exporter 2>/dev/null || true'
-ExecStartPre=-{{ devture_systemd_docker_base_host_command_sh }} -c '{{ devture_systemd_docker_base_host_command_docker }} rm matrix-prometheus-postgres-exporter 2>/dev/null || true'
-
-
-ExecStart={{ devture_systemd_docker_base_host_command_docker }} run --rm --name matrix-prometheus-postgres-exporter \
-			--log-driver=none \
-			--user={{ matrix_user_uid }}:{{ matrix_user_gid }} \
-			--cap-drop=ALL \
-			--read-only \
-			{% for arg in matrix_prometheus_postgres_exporter_container_extra_arguments %}
-			{{ arg }} \
-			{% endfor %}
-			--network={{ matrix_docker_network }} \
-			{% if matrix_prometheus_postgres_exporter_container_http_host_bind_port %}
-			-p {{ matrix_prometheus_postgres_exporter_container_http_host_bind_port }}:{{matrix_prometheus_postgres_exporter_port}} \
-			{% endif %}
-			--pid=host \
-			{{ matrix_prometheus_postgres_exporter_docker_image }}
-
-ExecStop=-{{ devture_systemd_docker_base_host_command_sh }} -c '{{ devture_systemd_docker_base_host_command_docker }} kill matrix-prometheus-postgres-exporter 2>/dev/null || true'
-ExecStop=-{{ devture_systemd_docker_base_host_command_sh }} -c '{{ devture_systemd_docker_base_host_command_docker }} rm matrix-prometheus-postgres-exporter 2>/dev/null || true'
-Restart=always
-RestartSec=30
-SyslogIdentifier=matrix-prometheus-postgres-exporter
-
-[Install]
-WantedBy=multi-user.target
diff --git a/roles/custom/matrix-prometheus-postgres-exporter/vars/main.yml b/roles/custom/matrix-prometheus-postgres-exporter/vars/main.yml
deleted file mode 100644
index aed3b2167..000000000
--- a/roles/custom/matrix-prometheus-postgres-exporter/vars/main.yml
+++ /dev/null
@@ -1,5 +0,0 @@
----
-
-# `matrix_prometheus_postgres_exporter_container_http_host_bind_port_number_raw` contains the raw port number extracted from `matrix_prometheus_postgres_exporter_container_http_host_bind_port`,
-# which can contain values like this: ('1234', '127.0.0.1:1234', '0.0.0.0:1234')
-matrix_prometheus_postgres_exporter_container_http_host_bind_port_number_raw: "{{ '' if matrix_prometheus_postgres_exporter_container_http_host_bind_port == '' else (matrix_prometheus_postgres_exporter_container_http_host_bind_port.split(':')[1] if ':' in matrix_prometheus_postgres_exporter_container_http_host_bind_port else matrix_prometheus_postgres_exporter_container_http_host_bind_port) }}"
diff --git a/roles/custom/matrix-prometheus-services-proxy-connect/defaults/main.yml b/roles/custom/matrix-prometheus-services-proxy-connect/defaults/main.yml
index 5799d0535..30ef2c130 100644
--- a/roles/custom/matrix-prometheus-services-proxy-connect/defaults/main.yml
+++ b/roles/custom/matrix-prometheus-services-proxy-connect/defaults/main.yml
@@ -13,3 +13,15 @@ matrix_prometheus_services_proxy_connect_prometheus_node_exporter_metrics_proxyi
 # If prometheus_node_exporter_container_http_host_bind_port is set to an IP that is not  0.0.0.0 and a port, that "<ip>:<port>" value will be used
 # Otherwise this value will be empty and you will have to manually configure your NGINX config file. (If you are using the config files generated by this playbook, you will have to edit matrix-domain.conf)
 matrix_prometheus_services_proxy_connect_prometheus_node_exporter_matrix_nginx_proxy_not_enabled_proxy_pass_host: "{{ '127.0.0.1' + prometheus_node_exporter_container_http_host_bind_port_number_raw if not ':' in prometheus_node_exporter_container_http_host_bind_port else (prometheus_node_exporter_container_http_host_bind_port if prometheus_node_exporter_container_http_host_bind_port.split(':')[0] != '0.0.0.0' else '') }}"
+
+
+# Controls whether postgres-exporter metrics should be proxied (exposed) on `matrix.DOMAIN/metrics/postgres-exporter`.
+# This will only work take effect if `matrix_nginx_proxy_proxy_matrix_metrics_enabled: true`.
+# See the `matrix-nginx-proxy` role for details about enabling `matrix_nginx_proxy_proxy_matrix_metrics_enabled`.
+matrix_prometheus_services_proxy_connect_prometheus_postgres_exporter_metrics_proxying_enabled: false
+
+# If you are supplying your own NGINX proxy but want to use the provided exporters you will have to supply an "<ip>:<port>" value for the containers to bind to on your host.
+# If prometheus_node_exporter_container_http_host_bind_port is set to just a port number, this will default to "127.0.0.1:<port>"
+# If prometheus_node_exporter_container_http_host_bind_port is set to an IP that is not  0.0.0.0 and a port, that "<ip>:<port>" value will be used
+# Otherwise this value will be empty and you will have to manually configure your NGINX config file. (If you are using the config files generated by this playbook, you will have to edit matrix-domain.conf)
+matrix_prometheus_services_proxy_connect_prometheus_postgres_exporter_matrix_nginx_proxy_not_enabled_proxy_pass_host: "{{ '127.0.0.1' + prometheus_postgres_exporter_container_http_host_bind_port_number_raw if not ':' in prometheus_postgres_exporter_container_http_host_bind_port else (prometheus_postgres_exporter_container_http_host_bind_port if prometheus_postgres_exporter_container_http_host_bind_port.split(':')[0] != '0.0.0.0' else '') }}"
diff --git a/roles/custom/matrix-prometheus-services-proxy-connect/tasks/main.yml b/roles/custom/matrix-prometheus-services-proxy-connect/tasks/main.yml
index 7f35a318d..e56546889 100644
--- a/roles/custom/matrix-prometheus-services-proxy-connect/tasks/main.yml
+++ b/roles/custom/matrix-prometheus-services-proxy-connect/tasks/main.yml
@@ -17,3 +17,12 @@
     - setup-nginx-proxy
     - install-all
     - install-nginx-proxy
+
+- block:
+    - when: prometheus_node_exporter_enabled | bool and matrix_prometheus_services_proxy_connect_prometheus_postgres_exporter_metrics_proxying_enabled | bool
+      ansible.builtin.include_tasks: "{{ role_path }}/tasks/prometheus-postgres-exporter/inject_into_nginx_proxy.yml"
+  tags:
+    - setup-all
+    - setup-nginx-proxy
+    - install-all
+    - install-nginx-proxy
diff --git a/roles/custom/matrix-prometheus-postgres-exporter/tasks/inject_into_nginx_proxy.yml b/roles/custom/matrix-prometheus-services-proxy-connect/tasks/prometheus-postgres-exporter/inject_into_nginx_proxy.yml
similarity index 51%
rename from roles/custom/matrix-prometheus-postgres-exporter/tasks/inject_into_nginx_proxy.yml
rename to roles/custom/matrix-prometheus-services-proxy-connect/tasks/prometheus-postgres-exporter/inject_into_nginx_proxy.yml
index 121efc17b..347960818 100644
--- a/roles/custom/matrix-prometheus-postgres-exporter/tasks/inject_into_nginx_proxy.yml
+++ b/roles/custom/matrix-prometheus-services-proxy-connect/tasks/prometheus-postgres-exporter/inject_into_nginx_proxy.yml
@@ -1,25 +1,16 @@
 ---
 
-- name: Fail if matrix-nginx-proxy role already executed
-  ansible.builtin.fail:
-    msg: >-
-      Trying to append postgres-exporter's reverse-proxying configuration to matrix-nginx-proxy,
-      but it's pointless since the matrix-nginx-proxy role had already executed.
-      To fix this, please change the order of roles in your playbook,
-      so that the matrix-nginx-proxy role would run after the matrix-prometheus-postgres-exporter role.
-  when: matrix_nginx_proxy_role_executed | default(False) | bool
-
 - name: Generate postgres-exporter metrics proxying configuration for matrix-nginx-proxy (matrix.DOMAIN/metrics/postgres-exporter)
   ansible.builtin.set_fact:
-    matrix_prometheus_postgres_exporter_nginx_metrics_configuration_block: |
+    matrix_prometheus_services_proxy_connect_postgres_exporter_nginx_metrics_configuration_block: |
       location /metrics/postgres-exporter {
         {% if matrix_nginx_proxy_enabled | default(False) %}
           {# Use the embedded DNS resolver in Docker containers to discover the service #}
           resolver 127.0.0.11 valid=5s;
-          set $backend "matrix-prometheus-postgres-exporter:9187";
+          set $backend "{{ prometheus_postgres_exporter_identifier }}:{{ prometheus_postgres_exporter_port }}";
           proxy_pass http://$backend/metrics;
-        {% elif matrix_prometheus_postgres_exporter_matrix_nginx_proxy_not_enabled_proxy_pass_host != '' %}
-          proxy_pass http://{{ matrix_prometheus_postgres_exporter_matrix_nginx_proxy_not_enabled_proxy_pass_host }}/metrics;
+        {% elif matrix_prometheus_services_proxy_connect_prometheus_postgres_exporter_matrix_nginx_proxy_not_enabled_proxy_pass_host != '' %}
+          proxy_pass http://{{ matrix_prometheus_services_proxy_connect_prometheus_postgres_exporter_matrix_nginx_proxy_not_enabled_proxy_pass_host }}/metrics;
         {% else %}
           return 404 "matrix-nginx-proxy is disabled and no host port was bound to the container, so metrics are unavailable";
         {% endif %}
@@ -31,5 +22,5 @@
       {{
         matrix_nginx_proxy_proxy_matrix_metrics_additional_system_location_configuration_blocks | default([])
         +
-        [matrix_prometheus_postgres_exporter_nginx_metrics_configuration_block]
+        [matrix_prometheus_services_proxy_connect_postgres_exporter_nginx_metrics_configuration_block]
       }}
diff --git a/roles/custom/matrix_playbook_migration/defaults/main.yml b/roles/custom/matrix_playbook_migration/defaults/main.yml
index b553160a9..496c4c753 100644
--- a/roles/custom/matrix_playbook_migration/defaults/main.yml
+++ b/roles/custom/matrix_playbook_migration/defaults/main.yml
@@ -2,3 +2,6 @@
 
 # Controls if (`matrix_prometheus_node_exporter` -> `prometheus_node_exporter`) validation will run.
 matrix_playbook_migration_matrix_prometheus_node_exporter_migration_validation_enabled: true
+
+# Controls if (`matrix_prometheus_postgres_exporter` -> `prometheus_postgres_exporter`) validation will run.
+matrix_playbook_migration_matrix_prometheus_postgres_exporter_migration_validation_enabled: true
diff --git a/roles/custom/matrix_playbook_migration/tasks/validate_config.yml b/roles/custom/matrix_playbook_migration/tasks/validate_config.yml
index 5d22e4bfe..b04c9e0e9 100644
--- a/roles/custom/matrix_playbook_migration/tasks/validate_config.yml
+++ b/roles/custom/matrix_playbook_migration/tasks/validate_config.yml
@@ -35,6 +35,7 @@
     - {'old': 'matrix_common_after_systemd_service_start_wait_for_timeout_seconds', 'new': 'devture_systemd_service_manager_up_verification_delay_seconds'}
     - {'old': 'matrix_systemd_services_autostart_enabled', 'new': 'devture_systemd_service_manager_services_autostart_enabled'}
     - {'old': 'matrix_prometheus_node_exporter_metrics_proxying_enabled', 'new': 'matrix_prometheus_services_proxy_connect_prometheus_node_exporter_metrics_proxying_enabled'}
+    - {'old': 'matrix_prometheus_postgres_exporter_metrics_proxying_enabled', 'new': 'matrix_prometheus_services_proxy_connect_prometheus_postgres_exporter_metrics_proxying_enabled'}
 
 - name: (Deprecation) Catch and report matrix_postgres variables
   ansible.builtin.fail:
@@ -64,3 +65,18 @@
           Please change your configuration (vars.yml) to rename all variables (`matrix_prometheus_node_exporter_` -> `prometheus_node_exporter_`).
           We found usage of the following variables: {{ matrix_playbook_migration_matrix_prometheus_node_exporter_migration_vars.keys() | join(', ') }}
       when: "matrix_playbook_migration_matrix_prometheus_node_exporter_migration_vars | length > 0"
+
+- when: matrix_playbook_migration_matrix_prometheus_postgres_exporter_migration_validation_enabled | bool
+  block:
+    - ansible.builtin.set_fact:
+        matrix_playbook_migration_matrix_prometheus_postgres_exporter_migration_vars: |-
+          {{ vars | dict2items | selectattr('key', 'match', 'matrix_prometheus_postgres_exporter_.*') | list | items2dict }}
+
+    - name: (Deprecation) Catch and report matrix_prometheus_postgres_exporter variables
+      ansible.builtin.fail:
+        msg: >-
+          The matrix-prometheus-postgres-exporter role that used to be part of this playbook has been replaced by https://gitlab.com/etke.cc/roles/prometheus_postgres_exporter.
+          The new role is compatible with the old one, but uses different names for its variables.
+          Please change your configuration (vars.yml) to rename all variables (`matrix_prometheus_postgres_exporter_` -> `prometheus_postgres_exporter_`).
+          We found usage of the following variables: {{ matrix_playbook_migration_matrix_prometheus_postgres_exporter_migration_vars.keys() | join(', ') }}
+      when: "matrix_playbook_migration_matrix_prometheus_postgres_exporter_migration_vars | length > 0"