Class: Datadog::OpenFeature::Hooks::FlagEvalMetricsHook

Inherits:
Object
  • Object
show all
Includes:
OpenFeature::SDK::Hooks::Hook
Defined in:
lib/datadog/open_feature/hooks/flag_eval_metrics_hook.rb

Overview

Records flag evaluation metrics via OpenTelemetry hook

Compatible with OpenFeature SDK >= 0.5.0 which provides the Hooks::Hook module, but also works with older versions since the SDK uses respond_to?(:finally) to detect hook capabilities.

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(metrics) ⇒ FlagEvalMetricsHook

Returns a new instance of FlagEvalMetricsHook.



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# File 'lib/datadog/open_feature/hooks/flag_eval_metrics_hook.rb', line 23

def initialize(metrics)
  @metrics = metrics
end

Class Method Details

.available? ⇒ Boolean

Returns true if the OpenFeature SDK supports hooks (>= 0.5.0)

Returns:

  • (Boolean) 


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# File 'lib/datadog/open_feature/hooks/flag_eval_metrics_hook.rb', line 19

def self.available?
  !!defined?(::OpenFeature::SDK::Hooks::Hook)
end

Instance Method Details

#finally(hook_context:, evaluation_details:, **_opts) ⇒ Object 



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# File 'lib/datadog/open_feature/hooks/flag_eval_metrics_hook.rb', line 27

def finally(hook_context:, evaluation_details:, **_opts)
  metrics = @metrics
  return unless metrics

  metrics.record(
    hook_context.flag_key,
    variant: evaluation_details.variant,
    reason: evaluation_details.reason,
    error_code: evaluation_details.error_code,
    allocation_key: extract_allocation_key(evaluation_details),
  )
end