+ def metrics
+ render content_type: 'text/plain', plain: <<~EOF
+# HELP arvados_config_load_timestamp_seconds Time when config file was loaded.
+# TYPE arvados_config_load_timestamp_seconds gauge
+arvados_config_load_timestamp_seconds{sha256="#{Rails.configuration.SourceSHA256}"} #{Rails.configuration.LoadTimestamp.to_f}
+# HELP arvados_config_source_timestamp_seconds Timestamp of config file when it was loaded.
+# TYPE arvados_config_source_timestamp_seconds gauge
+arvados_config_source_timestamp_seconds{sha256="#{Rails.configuration.SourceSHA256}"} #{Rails.configuration.SourceTimestamp.to_f}
+# HELP arvados_version_running Indicated version is running.
+# TYPE arvados_version_running gauge
+arvados_version_running{version="#{AppVersion.package_version}"} 1
+EOF
+ end
+
+ def health