Class: Datadog::Core::Runtime::Metrics

Inherits:
Metrics::Client show all
Defined in:
lib/datadog/core/runtime/metrics.rb

Overview

For generating runtime metrics

Constant Summary

Constants included from Metrics::Options

Metrics::Options::DEFAULT

Instance Attribute Summary

Attributes inherited from Metrics::Client

#statsd

Instance Method Summary collapse

Methods inherited from Metrics::Client

#close, #configure, #count, #default_hostname, #default_port, #default_statsd_client, #distribution, #enabled=, #enabled?, #gauge, #increment, #send_metrics, #send_stats?, #supported?, #time

Methods included from Metrics::Options

#metric_options

Constructor Details

#initialize(**options) ⇒ Metrics

Returns a new instance of Metrics.



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# File 'lib/datadog/core/runtime/metrics.rb', line 14

def initialize(**options)
  super

  # Initialize service list
  @services = Set.new(options.fetch(:services, []))
  @service_tags = nil
  compile_service_tags!
end

Instance Method Details

#default_metric_options ⇒ Object 



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# File 'lib/datadog/core/runtime/metrics.rb', line 95

def default_metric_options
  # Return dupes, so that the constant isn't modified,
  # and defaults are unfrozen for mutation in Statsd.
  super.tap do |options|
    options[:tags] = options[:tags].dup

    # Add services dynamically because they might change during runtime.
    options[:tags].concat(service_tags) unless service_tags.nil?
  end
end

#flush ⇒ Object

Flush all runtime metrics to Statsd client



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# File 'lib/datadog/core/runtime/metrics.rb', line 39

def flush
  return unless enabled?

  try_flush do
    if Core::Environment::ClassCount.available?
      gauge(Core::Runtime::Ext::Metrics::METRIC_CLASS_COUNT, Core::Environment::ClassCount.value)
    end
  end

  try_flush do
    if Core::Environment::ThreadCount.available?
      gauge(Core::Runtime::Ext::Metrics::METRIC_THREAD_COUNT, Core::Environment::ThreadCount.value)
    end
  end

  try_flush { gc_metrics.each { |metric, value| gauge(metric, value) } if Core::Environment::GC.available? }

  try_flush do
    if Core::Environment::VMCache.available?
      # Only on Ruby < 3.2
      gauge_if_not_nil(
        Core::Runtime::Ext::Metrics::METRIC_GLOBAL_CONSTANT_STATE,
        Core::Environment::VMCache.global_constant_state
      )

      # Only on Ruby 2.x
      gauge_if_not_nil(
        Core::Runtime::Ext::Metrics::METRIC_GLOBAL_METHOD_STATE,
        Core::Environment::VMCache.global_method_state
      )

      # Only on Ruby >= 3.2
      gauge_if_not_nil(
        Core::Runtime::Ext::Metrics::METRIC_CONSTANT_CACHE_INVALIDATIONS,
        Core::Environment::VMCache.constant_cache_invalidations
      )
      gauge_if_not_nil(
        Core::Runtime::Ext::Metrics::METRIC_CONSTANT_CACHE_MISSES,
        Core::Environment::VMCache.constant_cache_misses
      )
    end
  end
end

#gc_metrics ⇒ Object 



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# File 'lib/datadog/core/runtime/metrics.rb', line 83

def gc_metrics
  Core::Environment::GC.stat.flat_map do |k, v|
    nested_gc_metric(Core::Runtime::Ext::Metrics::METRIC_GC_PREFIX, k, v)
  end.to_h
end

#register_service(service) ⇒ Object

Associate service with runtime metrics



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# File 'lib/datadog/core/runtime/metrics.rb', line 24

def register_service(service)
  return unless enabled? && service

  service = service.to_s

  unless @services.include?(service)
    # Add service to list and update services tag
    services << service

    # Recompile the service tags
    compile_service_tags!
  end
end

#try_flush ⇒ Object 



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# File 'lib/datadog/core/runtime/metrics.rb', line 89

def try_flush
  yield
rescue StandardError => e
  Datadog.logger.error("Error while sending runtime metric. Cause: #{e.class.name} #{e.message}")
end