Module: Datadog::Tracing::MeasuredBuffer

Included in:
CRubyTraceBuffer, ThreadSafeTraceBuffer
Defined in:
lib/datadog/tracing/buffer.rb

Overview

Health metrics for trace buffers.

Instance Method Summary collapse

Instance Method Details

#add!(trace) ⇒ Object 



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# File 'lib/datadog/tracing/buffer.rb', line 20

def add!(trace)
  super

  # Emit health metrics
  measure_accept(trace)
end

#add_all!(traces) ⇒ Object 



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# File 'lib/datadog/tracing/buffer.rb', line 27

def add_all!(traces)
  super

  # Emit health metrics
  traces.each { |trace| measure_accept(trace) }
end

#drain! ⇒ Object

Stored traces are returned and the local buffer is reset.



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# File 'lib/datadog/tracing/buffer.rb', line 45

def drain!
  traces = super
  measure_pop(traces)
  traces
end

#initialize(*_) ⇒ Object 



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# File 'lib/datadog/tracing/buffer.rb', line 11

def initialize(*_)
  super

  @buffer_accepted = 0
  @buffer_accepted_lengths = 0
  @buffer_dropped = 0
  @buffer_spans = 0
end

#measure_accept(trace) ⇒ Object 



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# File 'lib/datadog/tracing/buffer.rb', line 51

def measure_accept(trace)
  @buffer_accepted += 1
  @buffer_accepted_lengths += trace.length

  @buffer_spans += trace.length
rescue StandardError => e
  Datadog.logger.debug(
    "Failed to measure queue accept. Cause: #{e.class.name} #{e.message} Source: #{Array(e.backtrace).first}"
  )
end

#measure_drop(trace) ⇒ Object 



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# File 'lib/datadog/tracing/buffer.rb', line 62

def measure_drop(trace)
  @buffer_dropped += 1

  @buffer_spans -= trace.length
rescue StandardError => e
  Datadog.logger.debug(
    "Failed to measure queue drop. Cause: #{e.class.name} #{e.message} Source: #{Array(e.backtrace).first}"
  )
end

#measure_pop(traces) ⇒ Object 



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# File 'lib/datadog/tracing/buffer.rb', line 72

def measure_pop(traces)
  # Accepted, cumulative totals
  Datadog.health_metrics.queue_accepted(@buffer_accepted)
  Datadog.health_metrics.queue_accepted_lengths(@buffer_accepted_lengths)

  # Dropped, cumulative totals
  Datadog.health_metrics.queue_dropped(@buffer_dropped)
  # TODO: are we missing a +queue_dropped_lengths+ metric?

  # Queue gauges, current values
  Datadog.health_metrics.queue_max_length(@max_size)
  Datadog.health_metrics.queue_spans(@buffer_spans)
  Datadog.health_metrics.queue_length(traces.length)

  # Reset aggregated metrics
  @buffer_accepted = 0
  @buffer_accepted_lengths = 0
  @buffer_dropped = 0
  @buffer_spans = 0
rescue StandardError => e
  Datadog.logger.debug(
    "Failed to measure queue. Cause: #{e.class.name} #{e.message} Source: #{Array(e.backtrace).first}"
  )
end

#replace!(trace) ⇒ Object 



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# File 'lib/datadog/tracing/buffer.rb', line 34

def replace!(trace)
  discarded_trace = super

  # Emit health metrics
  measure_accept(trace)
  measure_drop(discarded_trace) if discarded_trace

  discarded_trace
end