Class: HeimdallApm::PointsCollection

Inherits:
Object
  • Object
show all
Defined in:
lib/heimdall_apm/points_collection.rb

Overview

Convert metrics hash from requests into an collection of points we want to track, but without aggregations and percentiles/std_dev calculations of same endpoints across multiples requests. These operations are deferred to InfluxDB, in favor of more granular data. This may change in the future if it proves non scalable.

Constant Summary collapse

ROOT_METRICS =

Metrics we want to explicitely keep separated into measurements. Everything else will be label as Ruby.

['Sql', 'Elastic', 'Redis'].map do |key|
  downcased = key.downcase
  [key, ["#{downcased}_time", "#{downcased}_count"]]
end.to_h

Instance Method Summary collapse

Constructor Details

#initialize ⇒ PointsCollection

Returns a new instance of PointsCollection.


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# File 'lib/heimdall_apm/points_collection.rb', line 18

def initialize
  @points = []
end

Instance Method Details

#append(txn, metrics) ⇒ Object 


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# File 'lib/heimdall_apm/points_collection.rb', line 30

def append(txn, metrics)
  timestamp   = txn.root_segment.stop_time
  series_name = txn.custom_series_name || (txn.web? ? 'app' : 'job')
  values      = Hash.new { |h, k| h[k] = 0 }

  tags = txn.tags || {}
  tags[:endpoint] = txn.scope

  metrics.each do |meta, stat|
    if ROOT_METRICS.key?(meta.type)
      time_key, count_key = ROOT_METRICS[meta.type]

      values[time_key]  += stat.total_exclusive_time
      values[count_key] += stat.call_count
    else
      values['ruby_time'] += stat.total_exclusive_time
    end

    values['total_time'] += stat.total_exclusive_time
  end

  # Segment time are in seconds, store them in milliseconds
  values.transform_values! { |v| v.is_a?(Integer) ? v : v * 1000 }

  @points << {
    series: series_name,
    timestamp: (timestamp * 1000).to_i,
    tags: tags,
    values: values
  }
end

#empty? ⇒ Boolean

Returns:

  • (Boolean) 

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# File 'lib/heimdall_apm/points_collection.rb', line 22

def empty?
  @points.empty?
end

#to_a ⇒ Object 


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# File 'lib/heimdall_apm/points_collection.rb', line 26

def to_a
  @points
end