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require 'prometheus/client/formats/text'
class MetricsController < ActionController::Base
protect_from_forgery with: :exception
include RequiresHealthToken
before_action :ensure_prometheus_metrics_are_enabled
CHECKS = [
Gitlab::HealthChecks::DbCheck,
Gitlab::HealthChecks::RedisCheck,
Gitlab::HealthChecks::FsShardsCheck
].freeze
def metrics
metrics_text = Prometheus::Client::Formats::Text.marshal_multiprocess(multiprocess_metrics_path)
response = "#{health_metrics_text}\n#{metrics_text}"
render text: response, content_type: 'text/plain; version=0.0.4'
end
private
def ensure_prometheus_metrics_are_enabled
return render_404 unless Gitlab::Metrics.prometheus_metrics_enabled?
end
def multiprocess_metrics_path
Rails.root.join(ENV['prometheus_multiproc_dir'])
end
def health_metrics_text
results = CHECKS.flat_map(&:metrics)
types = results.map(&:name).uniq.map { |metric_name| "# TYPE #{metric_name} gauge" }
metrics = results.map(&method(:metric_to_prom_line))
types.concat(metrics).join("\n")
end
def metric_to_prom_line(metric)
labels = metric.labels&.map { |key, value| "#{key}=\"#{value}\"" }&.join(',') || ''
if labels.empty?
"#{metric.name} #{metric.value}"
else
"#{metric.name}{#{labels}} #{metric.value}"
end
end
end
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