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require 'prometheus/client/support/unicorn'
module Gitlab
module Metrics
module Samplers
class RubySampler < BaseSampler
def metrics
@metrics ||= init_metrics
end
def with_prefix(prefix, name)
"ruby_#{prefix}_#{name}".to_sym
end
def to_doc_string(name)
name.to_s.humanize
end
def labels
{}
end
def init_metrics
metrics = {}
metrics[:sampler_duration] = Metrics.histogram(with_prefix(:sampler_duration, :seconds), 'Sampler time', { worker: nil })
metrics[:total_time] = Metrics.gauge(with_prefix(:gc, :time_total), 'Total GC time', labels, :livesum)
GC.stat.keys.each do |key|
metrics[key] = Metrics.gauge(with_prefix(:gc, key), to_doc_string(key), labels, :livesum)
end
metrics[:objects_total] = Metrics.gauge(with_prefix(:objects, :total), 'Objects total', labels.merge(class: nil), :livesum)
metrics[:memory_usage] = Metrics.gauge(with_prefix(:memory, :usage_total), 'Memory used total', labels, :livesum)
metrics[:file_descriptors] = Metrics.gauge(with_prefix(:file, :descriptors_total), 'File descriptors total', labels, :livesum)
metrics
end
def sample
start_time = System.monotonic_time
sample_gc
metrics[:memory_usage].set(labels, System.memory_usage)
metrics[:file_descriptors].set(labels, System.file_descriptor_count)
metrics[:sampler_duration].observe(labels.merge(worker_label), System.monotonic_time - start_time)
ensure
GC::Profiler.clear
end
private
def sample_gc
metrics[:total_time].set(labels, GC::Profiler.total_time * 1000)
GC.stat.each do |key, value|
metrics[key].set(labels, value)
end
end
def worker_label
return {} unless defined?(Unicorn::Worker)
worker_no = ::Prometheus::Client::Support::Unicorn.worker_id
if worker_no
{ worker: worker_no }
else
{ worker: 'master' }
end
end
end
end
end
end
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