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feat(monitoring): add nginx, postgres, valkey prometheus exporters

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- nginx: nginx-prometheus-exporter gated by nginx_exporter_enabled,
  deploys loopback-only stub_status (8090), exporter on 9113
- postgres: postgres_exporter gated by postgres_exporter_enabled,
  creates postgres_exporter role with pg_monitor, exporter on 9187
- valkey: redis_exporter gated by valkey_exporter_enabled, adds
  read-only ACL user to users.acl, exporter on 9121

Each exporter follows the nut pattern (tasks/exporter.yml included from
main.yml, OS vars, 0600 secret env files, password asserts).
This commit is contained in:
Clément Désiles
2026-09-06 09:37:36 +02:00
parent 6f1f7f88f0
commit aa78e238aa
26 changed files with 304 additions and 0 deletions
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roles/nginx/defaults/main.yml
+7
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@@ -44,3 +44,10 @@ nginx_forwarder: {}
# Let's Encrypt / Certbot configuration
# acme_email: "" # Required for Let's Encrypt - intentionally undefined
# Set this variable to enable Certbot installation and certificate management
# Prometheus exporter (optional, via nginx-prometheus-exporter)
# Scrapes a loopback-only stub_status endpoint this role deploys.
nginx_exporter_enabled: false
nginx_exporter_listen_address: "127.0.0.1:9113"
nginx_exporter_stub_status_listen: "127.0.0.1:8090"
nginx_exporter_scrape_uri: "http://127.0.0.1:8090/stub_status"