Class: OpenTelemetry::SDK::Metrics::Aggregation::LastValue

Inherits:
Object
  • Object
show all
Includes:
StreamScopedStorage
Defined in:
lib/opentelemetry/sdk/metrics/aggregation/last_value.rb

Overview

Contains the implementation of the LastValue aggregation

Constant Summary collapse

OVERFLOW_ATTRIBUTE_SET = 
{ 'otel.metric.overflow' => true }.freeze

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(exemplar_reservoir: nil) ⇒ LastValue

Returns a new instance of LastValue.



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# File 'lib/opentelemetry/sdk/metrics/aggregation/last_value.rb', line 22

def initialize(exemplar_reservoir: nil)
  @exemplar_reservoir = exemplar_reservoir || DEFAULT_RESERVOIR
  @exemplar_reservoir_storage = new_stream_storage
end

Instance Attribute Details

#exemplar_reservoir ⇒ Object (readonly)

Returns the value of attribute exemplar_reservoir.



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# File 'lib/opentelemetry/sdk/metrics/aggregation/last_value.rb', line 16

def exemplar_reservoir
  @exemplar_reservoir
end

Instance Method Details

#collect(start_time, end_time, data_points) ⇒ Object

Returns the current data points, clearing them for delta temporality.



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# File 'lib/opentelemetry/sdk/metrics/aggregation/last_value.rb', line 28

def collect(start_time, end_time, data_points)
  stream_exemplar_reservoir_storage = @exemplar_reservoir_storage[data_points]

  ndps = data_points.values.map! do |ndp|
    ndp.start_time_unix_nano = start_time
    ndp.time_unix_nano = end_time
    reservoir = stream_exemplar_reservoir_storage[ndp.attributes]
    ndp.exemplars = reservoir&.collect(attributes: ndp.attributes, aggregation_temporality: :delta)
    ndp
  end
  data_points.clear
  ndps
end

#update(increment, attributes, data_points, cardinality_limit, exemplar_offer: false) ⇒ Object

Replaces the last recorded value for the given attributes.



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# File 'lib/opentelemetry/sdk/metrics/aggregation/last_value.rb', line 43

def update(increment, attributes, data_points, cardinality_limit, exemplar_offer: false)
  # Check if we already have this attribute set
  ndp = if data_points.key?(attributes)
          data_points[attributes]
        elsif data_points.size >= cardinality_limit - 1
          data_points[OVERFLOW_ATTRIBUTE_SET] || create_new_data_point(OVERFLOW_ATTRIBUTE_SET, data_points)
        else
          create_new_data_point(attributes, data_points)
        end

  update_number_data_point(ndp, increment, data_points, exemplar_offer: exemplar_offer)
  nil
end