feat: emit two new open census metrics for idle sessions removal and long-running sessions removal. #7080
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| Job | Run time |
|---|---|
| 2m 2s | |
| 1m 24s | |
| 2m 44s | |
| 1m 39s | |
| 4m 33s | |
| 3m 26s | |
| 3m 43s | |
| 8m 52s | |
| 28m 23s |