111 lines
3 KiB
Ruby
111 lines
3 KiB
Ruby
require 'prometheus/client/support/unicorn'
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module Gitlab
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module Metrics
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module Samplers
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class RubySampler < BaseSampler
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def metrics
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@metrics ||= init_metrics
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end
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def with_prefix(prefix, name)
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"ruby_#{prefix}_#{name}".to_sym
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end
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def to_doc_string(name)
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name.to_s.humanize
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end
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def labels
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{}
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end
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def initialize(interval)
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super(interval)
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if Metrics.mri?
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require 'allocations'
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Allocations.start
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end
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end
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def init_metrics
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metrics = {}
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metrics[:sampler_duration] = Metrics.histogram(with_prefix(:sampler_duration, :seconds), 'Sampler time', {})
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metrics[:total_time] = Metrics.gauge(with_prefix(:gc, :time_total), 'Total GC time', labels, :livesum)
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GC.stat.keys.each do |key|
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metrics[key] = Metrics.gauge(with_prefix(:gc, key), to_doc_string(key), labels, :livesum)
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end
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metrics[:objects_total] = Metrics.gauge(with_prefix(:objects, :total), 'Objects total', labels.merge(class: nil), :livesum)
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metrics[:memory_usage] = Metrics.gauge(with_prefix(:memory, :usage_total), 'Memory used total', labels, :livesum)
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metrics[:file_descriptors] = Metrics.gauge(with_prefix(:file, :descriptors_total), 'File descriptors total', labels, :livesum)
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metrics
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end
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def sample
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start_time = System.monotonic_time
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sample_gc
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sample_objects
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metrics[:memory_usage].set(labels, System.memory_usage)
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metrics[:file_descriptors].set(labels, System.file_descriptor_count)
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metrics[:sampler_duration].observe(labels.merge(worker_label), (System.monotonic_time - start_time) / 1000.0)
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ensure
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GC::Profiler.clear
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end
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private
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def sample_gc
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metrics[:total_time].set(labels, GC::Profiler.total_time * 1000)
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GC.stat.each do |key, value|
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metrics[key].set(labels, value)
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end
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end
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def sample_objects
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list_objects.each do |name, count|
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metrics[:objects_total].set(labels.merge(class: name), count)
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end
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end
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if Metrics.mri?
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def list_objects
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sample = Allocations.to_hash
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counts = sample.each_with_object({}) do |(klass, count), hash|
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name = klass.name
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next unless name
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hash[name] = count
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end
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# Symbols aren't allocated so we'll need to add those manually.
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counts['Symbol'] = Symbol.all_symbols.length
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counts
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end
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else
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def list_objects
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end
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end
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def worker_label
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return {} unless defined?(Unicorn::Worker)
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worker_no = ::Prometheus::Client::Support::Unicorn.worker_id
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if worker_no
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{ unicorn: worker_no }
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else
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{ unicorn: 'master' }
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end
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end
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end
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end
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end
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end
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