Class: Gitlab::Metrics::Exporter::MetricsMiddleware

Inherits:
Object
  • Object
show all
Defined in:
lib/gitlab/metrics/exporter/metrics_middleware.rb

Instance Method Summary collapse

Constructor Details

#initialize(app, pid) ⇒ MetricsMiddleware

Returns a new instance of MetricsMiddleware.



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# File 'lib/gitlab/metrics/exporter/metrics_middleware.rb', line 7

def initialize(app, pid)
  @app = app
  default_labels = {
    pid: pid
  }
  @requests_total = Gitlab::Metrics.counter(
    :exporter_http_requests_total, 'Total number of HTTP requests', default_labels
  )
  @request_durations = Gitlab::Metrics.histogram(
    :exporter_http_request_duration_seconds,
    'HTTP request duration histogram (seconds)',
    default_labels,
    [0.025, 0.05, 0.1, 0.25, 0.5, 1, 2.5, 5, 10]
  )
end

Instance Method Details

#call(env) ⇒ Object 



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# File 'lib/gitlab/metrics/exporter/metrics_middleware.rb', line 23

def call(env)
  start = Gitlab::Metrics::System.monotonic_time
  @app.call(env).tap do |response|
    duration = Gitlab::Metrics::System.monotonic_time - start

    labels = {
      method: env['REQUEST_METHOD'].downcase,
      path: env['PATH_INFO'].to_s,
      code: response.first.to_s
    }

    @requests_total.increment(labels)
    @request_durations.observe(labels, duration)
  end
end