Discourse Prometheus

Plugin
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:discourse2: Summary Discourse Prometheus is the official Prometheus exporter for Discourse
:hammer_and_wrench: Repository Link https://github.com/discourse/discourse-prometheus
:open_book: Install Guide How to install plugins in Discourse

The Discourse Prometheus plugin collects key metrics from Discourse and exposes them in the /metrics path so prometheus can consume them.

These metrics can be used to Graph all sorts of data like:

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Median and 99th percentile times for topic / categories / top and latest pages. Breaking down execution time between SQL/Redis and App.

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Page view tracking

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Error tracking

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Ruby object space tracking including allocation rate, heaps and so on.

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Hosted V8 memory statistics

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Scheduled Job Queue and Sidekiq job durations and executions.

To see a full list of metrics available, install the plugin and visit SITENAME/metrics as an admin.

Out of the box we allow the metrics route to admins and private ips.

Discourse Prometheus is smart enough to aggregate data for all forked unicorn processes and present it as cohesive metrics on a single endpoint. We use it internally to keep track of our sites.

Sample dashboard at:

Discourse global setting called prometheus_trusted_ip_allowlist_regex (env: DISCOURSE_PROMETHEUS_TRUSTED_IP_ALLOWLIST_REGEX) is allowing to set Prometheus’s trusted IP addresses. The setting accepts regular expression to set advanced IP ranges. This is useful in a case when Prometheus IP address is dynamic.

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Sto attualmente gestendo discourse su Kubernetes, in esecuzione su più pod app e sidekiq. Ho un paio di domande riguardo al plugin:

  1. Il plugin aggrega le metriche da tutti i pod dell’app? Presumo che aggreghi le metriche per i processi unicorn in esecuzione su una singola istanza/pod.
  2. Sono curioso del motivo per cui si osservano i tempi solo per alcune azioni del controller. Questa query è correlata al codice su discourse-prometheus/lib/collector.rb at main · discourse/discourse-prometheus · GitHub.
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Ciao,

Dove posso trovare l’impostazione prometheus_trusted_ip_allowlist_regex? :crying_cat_face:

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Sto usando Discourse v3.4.0.beta3-dev

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Devi impostare DISCOURSE_PROMETHEUS_TRUSTED_IP_ALLOWIST_REGEX in app.yml.

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Non sono sicuro di cosa stia succedendo, ma questa integrazione non funziona più. Non riesco a far visualizzare nulla al dashboard in Grafana… /metrics restituisce qualcosa, ma qualsiasi altra cosa non funziona veramente.

Molti errori come quello sottostante

Started GET "/metrics/api/v1/label/instance/values?limit=40000&start=1760980620&end=1760982480&match[]=discourse_page_views" for 16.63.57.20 at 2025-10-20 17:47:07 +0000
Started GET "/metrics/api/v1/label/job/values?limit=40000&start=1760980620&end=1760982480&match[]=discourse_page_views%7B%7D" for 16.63.57.20 at 2025-10-20 17:47:07 +0000
  Rendered layout layouts/no_ember.html.erb (Duration: 21.1ms | GC: 0.0ms)
  Rendered layout layouts/no_ember.html.erb (Duration: 26.0ms | GC: 0.0ms)
Started POST "/metrics/api/v1/query_range" for 16.63.57.20 at 2025-10-20 17:47:07 +0000
Started POST "/metrics/api/v1/query_range" for 16.63.57.20 at 2025-10-20 17:47:07 +0000
Started POST "/metrics/api/v1/query_range" for 16.63.57.20 at 2025-10-20 17:47:07 +0000
Started POST "/metrics/api/v1/query_range" for 16.63.57.20 at 2025-10-20 17:47:07 +0000
Started POST "/metrics/api/v1/query_range" for 16.63.57.20 at 2025-10-20 17:47:07 +0000
  Rendered layout layouts/no_ember.html.erb (Duration: 19.8ms | GC: 0.0ms)
  Rendered layout layouts/no_ember.html.erb (Duration: 28.2ms | GC: 0.0ms)
  Rendered layout layouts/no_ember.html.erb (Duration: 34.6ms | GC: 0.0ms)
  Rendered layout layouts/no_ember.html.erb (Duration: 44.4ms | GC: 0.0ms)
  Rendered layout layouts/no_ember.html.erb (Duration: 41.7ms | GC: 0.0ms)
Started POST "/metrics/api/v1/query_range" for 16.63.57.20 at 2025-10-20 17:47:07 +0000
Started POST "/metrics/api/v1/query_range" for 16.63.57.20 at 2025-10-20 17:47:08 +0000
Started POST "/metrics/api/v1/query_range" for 16.63.57.20 at 2025-10-20 17:47:08 +0000
Started POST "/metrics/api/v1/query_range" for 16.63.57.20 at 2025-10-20 17:47:08 +0000
  Rendered layout layouts/no_ember.html.erb (Duration: 23.6ms | GC: 0.0ms)
  Rendered layout layouts/no_ember.html.erb (Duration: 24.9ms | GC: 0.0ms)
  Rendered layout layouts/no_ember.html.erb (Duration: 19.9ms | GC: 0.0ms)
  Rendered layout layouts/no_ember.html.erb (Duration: 21.6ms | GC: 0.0ms)
Started GET "/metrics/api/v1/label/job/values?limit=40000&start=1760980620&end=1760982480&match[]=discourse_page_views%7B%7D" for 16.63.57.20 at 2025-10-20 17:47:37 +0000
Started GET "/metrics/api/v1/label/instance/values?limit=40000&start=1760980620&end=1760982480&match[]=discourse_page_views" for 16.63.57.20 at 2025-10-20 17:47:37 +0000
  Rendered layout layouts/no_ember.html.erb (Duration: 19.5ms | GC: 0.0ms)
  Rendered layout layouts/no_ember.html.erb (Duration: 20.9ms | GC: 0.0ms)
Started POST "/metrics/api/v1/query_range" for 16.63.57.20 at 2025-10-20 17:47:37 +0000
Started POST "/metrics/api/v1/query_range" for 16.63.57.20 at 2025-10-20 17:47:37 +0000
Started POST "/metrics/api/v1/query_range" for 16.63.57.20 at 2025-10-20 17:47:37 +0000
Started POST "/metrics/api/v1/query_range" for 16.63.57.20 at 2025-10-20 17:47:37 +0000
Started POST "/metrics/api/v1/query_range" for 16.63.57.20 at 2025-10-20 17:47:37 +0000
  Rendered layout layouts/no_ember.html.erb (Duration: 22.4ms | GC: 0.0ms)
  Rendered layout layouts/no_ember.html.erb (Duration: 22.0ms | GC: 0.0ms)
  Rendered layout layouts/no_ember.html.erb (Duration: 40.0ms | GC: 0.0ms)
  Rendered layout layouts/no_ember.html.erb (Duration: 37.0ms | GC: 0.0ms)
  Rendered layout layouts/no_ember.html.erb (Duration: 24.8ms | GC: 1.6ms)
105

Ri-condivido questo perché ho trovato una soluzione che ha funzionato per me Discourse Prometheus 404 metrics for Grafana - #2 by DevTeVe