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Add an optional metric exporter (#33734)

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Renaud Chaput 2025-01-27 13:52:30 +01:00 • committed by GitHub
parent b868e30fdf
commit 59384282ed
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config/initializers/prometheus_exporter.rb Normal file
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# frozen_string_literal: true
if ENV['MASTODON_PROMETHEUS_EXPORTER_ENABLED'] == 'true'
if ENV['MASTODON_PROMETHEUS_EXPORTER_LOCAL'] == 'true'
require 'prometheus_exporter/server'
require 'prometheus_exporter/client'
# bind is the address, on which the webserver will listen
# port is the port that will provide the /metrics route
server = PrometheusExporter::Server::WebServer.new bind: ENV.fetch('MASTODON_PROMETHEUS_EXPORTER_HOST', 'localhost'), port: ENV.fetch('MASTODON_PROMETHEUS_EXPORTER_PORT', '9394').to_i
server.start
# wire up a default local client
PrometheusExporter::Client.default = PrometheusExporter::LocalClient.new(collector: server.collector)
end
if ENV['MASTODON_PROMETHEUS_EXPORTER_WEB_DETAILED_METRICS'] == 'true'
# Optional, as those metrics might generate extra overhead and be redundant with what OTEL provides
require 'prometheus_exporter/middleware'
# Per-action/controller request stats like HTTP status and timings
Rails.application.middleware.unshift PrometheusExporter::Middleware
end
end