Enable Metrics status

[kusumachalasani]

Enable "status" for metrics of Kruize API and DB methods.
Below is one of the metric which shows both success and failure status.

kruizeAPI_count{api="listExperiments",application="Kruize",method="GET",status="failure",} 7.0
kruizeAPI_sum{api="listExperiments",application="Kruize",method="GET",status="failure",} 0.015359167
kruizeAPI_count{api="listExperiments",application="Kruize",method="GET",status="success",} 3.0
kruizeAPI_sum{api="listExperiments",application="Kruize",method="GET",status="success",} 0.003072515

[chandrams]

@kusumachalasani - I couldn't find the metrics API in monitoringAPI.md, can you please point me to the documentation. Also ensure the documentation is updated with these changes and update the tests to check for status.

[kusumachalasani]

Updated the documentation. Will be updating the tests related to this as part of PR #835

[dinogun]

LGTM