Report data about http requests and ruby vm

config/initializers/prometheus.rb

@@ -0,0 +1,10 @@
+require 'prometheus_exporter/middleware'
+
+# This reports stats per request like HTTP status and timings
+Rails.application.middleware.unshift PrometheusExporter::Middleware
+
+require 'prometheus_exporter/instrumentation'
+
+# this reports basic process stats like RSS and GC info, type master
+# means it is instrumenting the master process
+PrometheusExporter::Instrumentation::Process.start(type: "master")