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johnhamelink/rack_gc_heap_instrumentation.rb

Created April 1, 2015 09:32
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rack_gc_heap_instrumentation.rb
require 'statsd'
class RackGcHeapInstrumentation
def initialize(app)
@app = app
@statsd = Statsd.new('localhost', 8125)
end
def call(env)
GC.enable # Ensure garbage colletion is enabled
ret = @app.call(env)
@statsd.gauge('api.heap.live_slots', GC.stat[:heap_live_slots].to_i, sample_rate: 0.5, tags: ['process:rails'])
return ret
end
end
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Usage:

In your config.ru:

require ::File.expand_path('../lib/rack_gc_heap_instrumentation', __FILE__)
use RackGcHeapInstrumentation
run Rails.application

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