Set appropriate timeouts for PrometheusClient

changelogs/unreleased/232468-prometheus-conn-timeout.yml

+---
+title: Set appropriate timeouts for PrometheusClient
+merge_request: 37924
+author:
+type: other

lib/gitlab/prometheus_client.rb

@@ -132,7 +132,7 @@ module Gitlab
     def http_options
       strong_memoize(:http_options) do
-        { follow_redirects: false }.merge(mapped_options)
+        { follow_redirects: false, open_timeout: 5, read_timeout: 10 }.merge(mapped_options)
       end
     end