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# frozen_string_literal: true
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.counter(with_prefix(:sampler, :duration_seconds_total), 'Sampler time', labels)
metrics[:total_time] = Metrics.counter(with_prefix(:gc, :duration_seconds_total), 'Total GC time', labels)
GC.stat.keys.each do |key|
metrics[key] = Metrics.gauge(with_prefix(:gc_stat, key), to_doc_string(key), labels, :livesum)
end
metrics[:memory_usage] = Metrics.gauge(with_prefix(:memory, :bytes), 'Memory used', labels, :livesum)
metrics[:file_descriptors] = Metrics.gauge(with_prefix(:file, :descriptors), 'File descriptors used', labels, :livesum)
metrics
end
def sample
start_time = System.monotonic_time
metrics[:memory_usage].set(labels.merge(worker_label), System.memory_usage)
metrics[:file_descriptors].set(labels.merge(worker_label), System.file_descriptor_count)
sample_gc
metrics[:sampler_duration].increment(labels, System.monotonic_time - start_time)
ensure
GC::Profiler.clear
end
private
def sample_gc
# Collect generic GC stats.
GC.stat.each do |key, value|
metrics[key].set(labels, value)
end
# Collect the GC time since last sample in float seconds.
metrics[:total_time].increment(labels, GC::Profiler.total_time)
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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