y the Prometheus handler configuration exists</a><li role=none aria-label="Verify Mixer metric instances configuration exists"><a href=#verify-mixer-metric-instances-configuration-exists>Verify Mixer metric instances configuration exists</a><li role=none aria-label="Verify there are no known configuration errors"><a href=#verify-there-are-no-known-configuration-errors>Verify there are no known configuration errors</a><li role=none aria-label="Verify Mixer is sending metric instances to the Prometheus adapte