Instrumenting Rails with Prometheus
To do so we can introduce a “type collector”: # lib/global_type_collector.rb unless defined? Rails require File.expand_path("../../config/environment", __FILE__) end require 'raindrops' class GlobalPrometheusCollector < PrometheusExporter::Server::TypeCollector include PrometheusExporter::Metric def initialize @web_queued = Gauge.new("web_queued", "Number of queued web requests") @web_active = Gau
Debugging 100% CPU usage in production Ruby on Rails systems
Sam Saffron Programming, Technology and the Art of Hacking Today I noticed one of our customer containers was running really high on CPU. # top -bn1 190 discour+ 20 0 2266292 205128 15656 S 86.7 0.3 9377:35 ruby # ps aux discour+ 190 19.4 0.3 2266292 207096 ? Sl 2017 9364:38 sidekiq 5.0.5 discourse [1 of 5 busy] Looks like sidekiq is stuck on a job. Where is it stuck? Usually, this is where the st
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