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# frozen_string_literal: true
module Gitlab
module Metrics
# Rack middleware for tracking Elasticsearch metrics from Grape and Web requests.
class ElasticsearchRackMiddleware
HISTOGRAM_BUCKETS = [0.1, 0.5, 1, 10, 50].freeze
def initialize(app)
@app = app
end
def call(env)
transaction = Gitlab::Metrics.current_transaction
@app.call(env)
ensure
record_metrics(transaction)
end
private
def record_metrics(transaction)
query_time = ::Gitlab::Instrumentation::ElasticsearchTransport.query_time
request_count = ::Gitlab::Instrumentation::ElasticsearchTransport.get_request_count
return unless request_count > 0
transaction.increment(:http_elasticsearch_requests_total, request_count) do
docstring 'Amount of calls to Elasticsearch servers during web requests'
end
transaction.observe(:http_elasticsearch_requests_duration_seconds, query_time) do
docstring 'Query time for Elasticsearch servers during web requests'
buckets HISTOGRAM_BUCKETS
end
end
end
end
end
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