Init initializes the metrics package.

RecordHttpResponseWriteFailure increments the http response write failure counter.

RecordQueueOperationFailure increments the queue operation failure counter.

RecordServiceCrash increments the service crash counter.

RecordUnprocessableEntity increments the unprocessable entity counter.

StartClientRequestDurationTimer starts a timer to measure outgoing client request duration.

StartHttpRequestDurationTimer starts a timer to measure http request handling duration.