Class: OpenTelemetry::Exporter::OTLP::Metrics::MetricsExporter

Inherits:
SDK::Metrics::Export::MetricReader
  • Object
show all
Includes:
Util
Defined in:
lib/opentelemetry/exporter/otlp/metrics/metrics_exporter.rb

Overview

An OpenTelemetry metrics exporter that sends metrics over HTTP as Protobuf encoded OTLP ExportMetricsServiceRequest.

Constant Summary

Constants included from Util

Util::DEFAULT_USER_AGENT, Util::ERROR_MESSAGE_INVALID_HEADERS, Util::KEEP_ALIVE_TIMEOUT, Util::RETRY_COUNT

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Util

#around_request, #as_otlp_any_value, #as_otlp_key_value, #backoff?, #handle_redirect, #http_connection, #log_status, #measure_request_duration, #parse_headers, #prepare_headers

Constructor Details

#initialize(endpoint: OpenTelemetry::Common::Utilities.config_opt('OTEL_EXPORTER_OTLP_METRICS_ENDPOINT', 'OTEL_EXPORTER_OTLP_ENDPOINT', default: 'http://localhost:4318/v1/metrics'), certificate_file: OpenTelemetry::Common::Utilities.config_opt('OTEL_EXPORTER_OTLP_METRICS_CERTIFICATE', 'OTEL_EXPORTER_OTLP_CERTIFICATE'), ssl_verify_mode: MetricsExporter.ssl_verify_mode, headers: OpenTelemetry::Common::Utilities.config_opt('OTEL_EXPORTER_OTLP_METRICS_HEADERS', 'OTEL_EXPORTER_OTLP_HEADERS', default: {}), compression: OpenTelemetry::Common::Utilities.config_opt('OTEL_EXPORTER_OTLP_METRICS_COMPRESSION', 'OTEL_EXPORTER_OTLP_COMPRESSION', default: 'gzip'), timeout: OpenTelemetry::Common::Utilities.config_opt('OTEL_EXPORTER_OTLP_METRICS_TIMEOUT', 'OTEL_EXPORTER_OTLP_TIMEOUT', default: 10)) ⇒ MetricsExporter

Returns a new instance of MetricsExporter.

Raises:

  • (ArgumentError) 


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# File 'lib/opentelemetry/exporter/otlp/metrics/metrics_exporter.rb', line 48

def initialize(endpoint: OpenTelemetry::Common::Utilities.config_opt('OTEL_EXPORTER_OTLP_METRICS_ENDPOINT', 'OTEL_EXPORTER_OTLP_ENDPOINT', default: 'http://localhost:4318/v1/metrics'),
               certificate_file: OpenTelemetry::Common::Utilities.config_opt('OTEL_EXPORTER_OTLP_METRICS_CERTIFICATE', 'OTEL_EXPORTER_OTLP_CERTIFICATE'),
               ssl_verify_mode: MetricsExporter.ssl_verify_mode,
               headers: OpenTelemetry::Common::Utilities.config_opt('OTEL_EXPORTER_OTLP_METRICS_HEADERS', 'OTEL_EXPORTER_OTLP_HEADERS', default: {}),
               compression: OpenTelemetry::Common::Utilities.config_opt('OTEL_EXPORTER_OTLP_METRICS_COMPRESSION', 'OTEL_EXPORTER_OTLP_COMPRESSION', default: 'gzip'),
               timeout: OpenTelemetry::Common::Utilities.config_opt('OTEL_EXPORTER_OTLP_METRICS_TIMEOUT', 'OTEL_EXPORTER_OTLP_TIMEOUT', default: 10))
  raise ArgumentError, "invalid url for OTLP::MetricsExporter #{endpoint}" unless OpenTelemetry::Common::Utilities.valid_url?(endpoint)
  raise ArgumentError, "unsupported compression key #{compression}" unless compression.nil? || %w[gzip none].include?(compression)

  # create the MetricStore object
  super()

  @uri = if endpoint == ENV['OTEL_EXPORTER_OTLP_ENDPOINT']
           URI.join(endpoint, 'v1/metrics')
         else
           URI(endpoint)
         end

  @http = http_connection(@uri, ssl_verify_mode, certificate_file)

  @path = @uri.path
  @headers = prepare_headers(headers)
  @timeout = timeout.to_f
  @compression = compression
  @mutex = Mutex.new
  @shutdown = false
end

Instance Attribute Details

#metric_snapshots ⇒ Object (readonly)

Returns the value of attribute metric_snapshots.



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# File 'lib/opentelemetry/exporter/otlp/metrics/metrics_exporter.rb', line 32

def metric_snapshots
  @metric_snapshots
end

Class Method Details

.ssl_verify_mode ⇒ Object 



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# File 'lib/opentelemetry/exporter/otlp/metrics/metrics_exporter.rb', line 38

def self.ssl_verify_mode
  if ENV.key?('OTEL_RUBY_EXPORTER_OTLP_SSL_VERIFY_PEER')
    OpenSSL::SSL::VERIFY_PEER
  elsif ENV.key?('OTEL_RUBY_EXPORTER_OTLP_SSL_VERIFY_NONE')
    OpenSSL::SSL::VERIFY_NONE
  else
    OpenSSL::SSL::VERIFY_PEER
  end
end

Instance Method Details

#as_otlp_aggregation_temporality(type) ⇒ Object 



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# File 'lib/opentelemetry/exporter/otlp/metrics/metrics_exporter.rb', line 261

def as_otlp_aggregation_temporality(type)
  case type
  when :delta then Opentelemetry::Proto::Metrics::V1::AggregationTemporality::AGGREGATION_TEMPORALITY_DELTA
  when :cumulative then Opentelemetry::Proto::Metrics::V1::AggregationTemporality::AGGREGATION_TEMPORALITY_CUMULATIVE
  else Opentelemetry::Proto::Metrics::V1::AggregationTemporality::AGGREGATION_TEMPORALITY_UNSPECIFIED
  end
end

#as_otlp_metrics(metrics) ⇒ Object

metrics_pb has following type of data: :gauge, :sum, :histogram, :exponential_histogram, :summary current metric sdk only implements instrument: :counter -> :sum, :histogram -> :histogram

metrics [MetricData]



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# File 'lib/opentelemetry/exporter/otlp/metrics/metrics_exporter.rb', line 218

def as_otlp_metrics(metrics) # rubocop:disable Metrics/MethodLength
  case metrics.instrument_kind
  when :observable_gauge
    Opentelemetry::Proto::Metrics::V1::Metric.new(
      name: metrics.name,
      description: metrics.description,
      unit: metrics.unit,
      gauge: Opentelemetry::Proto::Metrics::V1::Gauge.new(
        aggregation_temporality: as_otlp_aggregation_temporality(metrics.aggregation_temporality),
        data_points: metrics.data_points.map do |ndp|
          number_data_point(ndp)
        end
      )
    )

  when :counter, :up_down_counter
    Opentelemetry::Proto::Metrics::V1::Metric.new(
      name: metrics.name,
      description: metrics.description,
      unit: metrics.unit,
      sum: Opentelemetry::Proto::Metrics::V1::Sum.new(
        aggregation_temporality: as_otlp_aggregation_temporality(metrics.aggregation_temporality),
        data_points: metrics.data_points.map do |ndp|
          number_data_point(ndp)
        end
      )
    )

  when :histogram
    Opentelemetry::Proto::Metrics::V1::Metric.new(
      name: metrics.name,
      description: metrics.description,
      unit: metrics.unit,
      histogram: Opentelemetry::Proto::Metrics::V1::Histogram.new(
        aggregation_temporality: as_otlp_aggregation_temporality(metrics.aggregation_temporality),
        data_points: metrics.data_points.map do |hdp|
          histogram_data_point(hdp)
        end
      )
    )
  end
end

#encode(metrics_data) ⇒ Object

rubocop:disable Metrics/MethodLength, Metrics/CyclomaticComplexity



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# File 'lib/opentelemetry/exporter/otlp/metrics/metrics_exporter.rb', line 184

def encode(metrics_data) # rubocop:disable Metrics/MethodLength, Metrics/CyclomaticComplexity
  Opentelemetry::Proto::Collector::Metrics::V1::ExportMetricsServiceRequest.encode(
    Opentelemetry::Proto::Collector::Metrics::V1::ExportMetricsServiceRequest.new(
      resource_metrics: metrics_data
        .group_by(&:resource)
        .map do |resource, scope_metrics|
          Opentelemetry::Proto::Metrics::V1::ResourceMetrics.new(
            resource: Opentelemetry::Proto::Resource::V1::Resource.new(
              attributes: resource.attribute_enumerator.map { |key, value| as_otlp_key_value(key, value) }
            ),
            scope_metrics: scope_metrics
              .group_by(&:instrumentation_scope)
              .map do |instrumentation_scope, metrics|
                Opentelemetry::Proto::Metrics::V1::ScopeMetrics.new(
                  scope: Opentelemetry::Proto::Common::V1::InstrumentationScope.new(
                    name: instrumentation_scope.name,
                    version: instrumentation_scope.version
                  ),
                  metrics: metrics.map { |sd| as_otlp_metrics(sd) }
                )
              end
          )
        end
    )
  )
rescue StandardError => e
  OpenTelemetry.handle_error(exception: e, message: 'unexpected error in OTLP::MetricsExporter#encode')
  nil
end

#export(metrics, timeout: nil) ⇒ Object

metrics Array



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# File 'lib/opentelemetry/exporter/otlp/metrics/metrics_exporter.rb', line 84

def export(metrics, timeout: nil)
  @mutex.synchronize do
    send_bytes(encode(metrics), timeout: timeout)
  end
end

#force_flush(timeout: nil) ⇒ Object 



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# File 'lib/opentelemetry/exporter/otlp/metrics/metrics_exporter.rb', line 299

def force_flush(timeout: nil)
  SUCCESS
end

#histogram_data_point(hdp) ⇒ Object 



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# File 'lib/opentelemetry/exporter/otlp/metrics/metrics_exporter.rb', line 269

def histogram_data_point(hdp)
  Opentelemetry::Proto::Metrics::V1::HistogramDataPoint.new(
    attributes: hdp.attributes.map { |k, v| as_otlp_key_value(k, v) },
    start_time_unix_nano: hdp.start_time_unix_nano,
    time_unix_nano: hdp.time_unix_nano,
    count: hdp.count,
    sum: hdp.sum,
    bucket_counts: hdp.bucket_counts,
    explicit_bounds: hdp.explicit_bounds,
    exemplars: hdp.exemplars,
    min: hdp.min,
    max: hdp.max
  )
end

#number_data_point(ndp) ⇒ Object 



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# File 'lib/opentelemetry/exporter/otlp/metrics/metrics_exporter.rb', line 284

def number_data_point(ndp)
  Opentelemetry::Proto::Metrics::V1::NumberDataPoint.new(
    attributes: ndp.attributes.map { |k, v| as_otlp_key_value(k, v) },
    as_int: ndp.value,
    start_time_unix_nano: ndp.start_time_unix_nano,
    time_unix_nano: ndp.time_unix_nano,
    exemplars: ndp.exemplars # exemplars not implemented yet from metrics sdk
  )
end

#pull ⇒ Object

consolidate the metrics data into the form of MetricData

return MetricData



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# File 'lib/opentelemetry/exporter/otlp/metrics/metrics_exporter.rb', line 79

def pull
  export(collect)
end

#reset ⇒ Object

may not need this



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# File 'lib/opentelemetry/exporter/otlp/metrics/metrics_exporter.rb', line 295

def reset
  SUCCESS
end

#send_bytes(bytes, timeout:) ⇒ Object

rubocop:disable Metrics/CyclomaticComplexity, Metrics/MethodLength, Metrics/PerceivedComplexity



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# File 'lib/opentelemetry/exporter/otlp/metrics/metrics_exporter.rb', line 90

def send_bytes(bytes, timeout:) # rubocop:disable Metrics/CyclomaticComplexity, Metrics/MethodLength, Metrics/PerceivedComplexity
  return FAILURE if bytes.nil?

  request = Net::HTTP::Post.new(@path)

  if @compression == 'gzip'
    request.add_field('Content-Encoding', 'gzip')
    body = Zlib.gzip(bytes)
  else
    body = bytes
  end

  request.body = body
  request.add_field('Content-Type', 'application/x-protobuf')
  @headers.each { |key, value| request.add_field(key, value) }

  retry_count = 0
  timeout ||= @timeout
  start_time = OpenTelemetry::Common::Utilities.timeout_timestamp

  around_request do
    remaining_timeout = OpenTelemetry::Common::Utilities.maybe_timeout(timeout, start_time)
    return FAILURE if remaining_timeout.zero?

    @http.open_timeout = remaining_timeout
    @http.read_timeout = remaining_timeout
    @http.write_timeout = remaining_timeout
    @http.start unless @http.started?
    response = measure_request_duration { @http.request(request) }
    case response
    when Net::HTTPOK
      response.body # Read and discard body
      SUCCESS
    when Net::HTTPServiceUnavailable, Net::HTTPTooManyRequests
      response.body # Read and discard body
      redo if backoff?(retry_after: response['Retry-After'], retry_count: retry_count += 1, reason: response.code)
      OpenTelemetry.logger.warn('Net::HTTPServiceUnavailable/Net::HTTPTooManyRequests in MetricsExporter#send_bytes')
      FAILURE
    when Net::HTTPRequestTimeOut, Net::HTTPGatewayTimeOut, Net::HTTPBadGateway
      response.body # Read and discard body
      redo if backoff?(retry_count: retry_count += 1, reason: response.code)
      OpenTelemetry.logger.warn('Net::HTTPRequestTimeOut/Net::HTTPGatewayTimeOut/Net::HTTPBadGateway in MetricsExporter#send_bytes')
      FAILURE
    when Net::HTTPNotFound
      OpenTelemetry.handle_error(message: "OTLP metrics_exporter received http.code=404 for uri: '#{@path}'")
      FAILURE
    when Net::HTTPBadRequest, Net::HTTPClientError, Net::HTTPServerError
      log_status(response.body)
      OpenTelemetry.logger.warn('Net::HTTPBadRequest/Net::HTTPClientError/Net::HTTPServerError in MetricsExporter#send_bytes')
      FAILURE
    when Net::HTTPRedirection
      @http.finish
      handle_redirect(response['location'])
      redo if backoff?(retry_after: 0, retry_count: retry_count += 1, reason: response.code)
    else
      @http.finish
      OpenTelemetry.logger.warn("Unexpected error in OTLP::MetricsExporter#send_bytes - #{response.message}")
      FAILURE
    end
  rescue Net::OpenTimeout, Net::ReadTimeout
    retry if backoff?(retry_count: retry_count += 1, reason: 'timeout')
    OpenTelemetry.logger.warn('Net::OpenTimeout/Net::ReadTimeout in MetricsExporter#send_bytes')
    return FAILURE
  rescue OpenSSL::SSL::SSLError
    retry if backoff?(retry_count: retry_count += 1, reason: 'openssl_error')
    OpenTelemetry.logger.warn('OpenSSL::SSL::SSLError in MetricsExporter#send_bytes')
    return FAILURE
  rescue SocketError
    retry if backoff?(retry_count: retry_count += 1, reason: 'socket_error')
    OpenTelemetry.logger.warn('SocketError in MetricsExporter#send_bytes')
    return FAILURE
  rescue SystemCallError => e
    retry if backoff?(retry_count: retry_count += 1, reason: e.class.name)
    OpenTelemetry.logger.warn('SystemCallError in MetricsExporter#send_bytes')
    return FAILURE
  rescue EOFError
    retry if backoff?(retry_count: retry_count += 1, reason: 'eof_error')
    OpenTelemetry.logger.warn('EOFError in MetricsExporter#send_bytes')
    return FAILURE
  rescue Zlib::DataError
    retry if backoff?(retry_count: retry_count += 1, reason: 'zlib_error')
    OpenTelemetry.logger.warn('Zlib::DataError in MetricsExporter#send_bytes')
    return FAILURE
  rescue StandardError => e
    OpenTelemetry.handle_error(exception: e, message: 'unexpected error in OTLP::MetricsExporter#send_bytes')
    return FAILURE
  end
ensure
  # Reset timeouts to defaults for the next call.
  @http.open_timeout = @timeout
  @http.read_timeout = @timeout
  @http.write_timeout = @timeout
end

#shutdown(timeout: nil) ⇒ Object 



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# File 'lib/opentelemetry/exporter/otlp/metrics/metrics_exporter.rb', line 303

def shutdown(timeout: nil)
  @shutdown = true
  SUCCESS
end