Class: ScoutApm::SlowPolicy::PercentilePolicy

Inherits:
Policy
  • Object
show all
Defined in:
lib/scout_apm/slow_policy/percentile_policy.rb

Instance Attribute Summary

Attributes inherited from Policy

#context

Instance Method Summary collapse

Methods inherited from Policy

#initialize, #stored!

Constructor Details

This class inherits a constructor from ScoutApm::SlowPolicy::Policy

Instance Method Details

#call(request) ⇒ Object 



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# File 'lib/scout_apm/slow_policy/percentile_policy.rb', line 5

def call(request)
  # What approximate percentile was this request?
  total_time = request.root_layer.total_call_time
  percentile = context.request_histograms.approximate_quantile_of_value(request.unique_name, total_time)

  if percentile < 40
    0.4 # Don't put much emphasis on capturing low percentiles.
  elsif percentile < 60
    1.4 # Highest here to get mean traces
  elsif percentile < 90
    0.7 # Between 60 & 90% is fine.
  elsif percentile >= 90
    1.4 # Highest here to get 90+%ile traces
  else
    # impossible.
    percentile
  end
end