Class: Rack::AI::Utils::Metrics

Inherits:
Object
  • Object
show all
Defined in:
lib/rack/ai/utils/metrics.rb

Class Method Summary collapse

Class Method Details

.decrement(counter_name, value = 1, tags = {}) ⇒ Object 



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# File 'lib/rack/ai/utils/metrics.rb', line 37

def decrement(counter_name, value = 1, tags = {})
  increment(counter_name, -value, tags)
end

.export_prometheus_format ⇒ Object 



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# File 'lib/rack/ai/utils/metrics.rb', line 106

def export_prometheus_format
  lines = []
  
  # Export counters
  @counters&.each do |key, value|
    metric_name, tags = parse_key(key)
    tags_str = format_prometheus_tags(tags)
    lines << "# TYPE #{metric_name} counter"
    lines << "#{metric_name}#{tags_str} #{value}"
  end

  # Export gauges
  @gauges&.each do |key, data|
    metric_name, tags = parse_key(key)
    tags_str = format_prometheus_tags(tags)
    lines << "# TYPE #{metric_name} gauge"
    lines << "#{metric_name}#{tags_str} #{data[:value]}"
  end

  # Export histogram summaries
  @histograms&.each do |key, values|
    next if values.empty?
    
    metric_name, tags = parse_key(key)
    stats = calculate_histogram_stats(values)
    tags_str = format_prometheus_tags(tags)
    
    lines << "# TYPE #{metric_name} histogram"
    lines << "#{metric_name}_count#{tags_str} #{stats[:count]}"
    lines << "#{metric_name}_sum#{tags_str} #{stats[:sum]}"
    
    [0.5, 0.9, 0.95, 0.99].each do |quantile|
      quantile_tags = tags.merge(quantile: quantile)
      quantile_tags_str = format_prometheus_tags(quantile_tags)
      lines << "#{metric_name}#{quantile_tags_str} #{stats[:"p#{(quantile * 100).to_i}"]}"
    end
  end

  lines.join("\n")
end

.gauge(metric_name, value, tags = {}) ⇒ Object 



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# File 'lib/rack/ai/utils/metrics.rb', line 52

def gauge(metric_name, value, tags = {})
  initialize_metrics unless @gauges
  
  key = build_key(metric_name, tags)
  @gauges[key] = {
    value: value,
    timestamp: Time.now.to_f,
    tags: tags
  }
end

.get_counter(counter_name, tags = {}) ⇒ Object 



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# File 'lib/rack/ai/utils/metrics.rb', line 63

def get_counter(counter_name, tags = {})
  return 0 unless @counters
  
  key = build_key(counter_name, tags)
  @counters[key] || 0
end

.get_gauge(metric_name, tags = {}) ⇒ Object 



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# File 'lib/rack/ai/utils/metrics.rb', line 89

def get_gauge(metric_name, tags = {})
  return nil unless @gauges
  
  key = build_key(metric_name, tags)
  @gauges[key]
end

.get_histogram_stats(metric_name, tags = {}) ⇒ Object 



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# File 'lib/rack/ai/utils/metrics.rb', line 70

def get_histogram_stats(metric_name, tags = {})
  return {} unless @histograms
  
  key = build_key(metric_name, tags)
  values = @histograms[key] || []
  return {} if values.empty?

  sorted_values = values.sort
  {
    count: values.length,
    min: sorted_values.first,
    max: sorted_values.last,
    mean: values.sum.to_f / values.length,
    median: percentile(sorted_values, 50),
    p95: percentile(sorted_values, 95),
    p99: percentile(sorted_values, 99)
  }
end

.get_metrics_summary ⇒ Object 



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# File 'lib/rack/ai/utils/metrics.rb', line 96

def get_metrics_summary
  {
    counters: @counters&.keys&.length || 0,
    histograms: @histograms&.keys&.length || 0,
    gauges: @gauges&.keys&.length || 0,
    metrics: @metrics&.keys&.length || 0,
    timestamp: Time.now.iso8601
  }
end

.histogram(metric_name, value, tags = {}) ⇒ Object 



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# File 'lib/rack/ai/utils/metrics.rb', line 41

def histogram(metric_name, value, tags = {})
  initialize_metrics unless @histograms
  
  key = build_key(metric_name, tags)
  @histograms[key] ||= []
  @histograms[key] << value

  # Keep only last 1000 values per histogram
  @histograms[key] = @histograms[key].last(1000)
end

.increment(counter_name, value = 1, tags = {}) ⇒ Object 



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# File 'lib/rack/ai/utils/metrics.rb', line 29

def increment(counter_name, value = 1, tags = {})
  initialize_metrics unless @counters
  
  key = build_key(counter_name, tags)
  @counters[key] ||= 0
  @counters[key] += value
end

.initialize_metrics ⇒ Object 



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# File 'lib/rack/ai/utils/metrics.rb', line 8

def initialize_metrics
  @metrics = {}
  @counters = {}
  @histograms = {}
  @gauges = {}
end

.record(metric_name, value, tags = {}) ⇒ Object 



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# File 'lib/rack/ai/utils/metrics.rb', line 15

def record(metric_name, value, tags = {})
  initialize_metrics unless @metrics
  
  @metrics[metric_name] ||= []
  @metrics[metric_name] << {
    value: value,
    timestamp: Time.now.to_f,
    tags: tags
  }

  # Keep only last 1000 measurements per metric
  @metrics[metric_name] = @metrics[metric_name].last(1000)
end

.reset_metrics! ⇒ Object 



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# File 'lib/rack/ai/utils/metrics.rb', line 147

def reset_metrics!
  @metrics = {}
  @counters = {}
  @histograms = {}
  @gauges = {}
end