feat(prometheus): add postal_message_queue_latency metric
#401
| Job | Run time |
|---|---|
| 29s | |
| 13s | |
| 1m 18s | |
| 54s | |
| 0s | |
| 2m 54s |
postal_message_queue_latency metric
#401
| Job | Run time |
|---|---|
| 29s | |
| 13s | |
| 1m 18s | |
| 54s | |
| 0s | |
| 2m 54s |