k5342 opened a new pull request #3088:
URL: https://github.com/apache/ozone/pull/3088
## What changes were proposed in this pull request?
Add an ability to Recon to export a new metrics about timestamps from
`ReconTaskStatus` table in Derby DB. Recon also has OzoneManagerSyncMetrics for
OM snapshot related tasks but this metrics focuses entire Recon sub-tasks.
```
# TYPE recon_task_status_metrics_last_updated_seq_number gauge
recon_task_status_metrics_last_updated_seq_number{type="ContainerHealthTask",hostname="localhost"}
0
recon_task_status_metrics_last_updated_seq_number{type="ContainerKeyMapperTask",hostname="localhost"}
2
recon_task_status_metrics_last_updated_seq_number{type="FileSizeCountTask",hostname="localhost"}
2
recon_task_status_metrics_last_updated_seq_number{type="NSSummaryTask",hostname="localhost"}
2
recon_task_status_metrics_last_updated_seq_number{type="OmDeltaRequest",hostname="localhost"}
2
recon_task_status_metrics_last_updated_seq_number{type="OmSnapshotRequest",hostname="localhost"}
2
recon_task_status_metrics_last_updated_seq_number{type="PipelineSyncTask",hostname="localhost"}
0
recon_task_status_metrics_last_updated_seq_number{type="TableCountTask",hostname="localhost"}
2
# TYPE recon_task_status_metrics_last_updated_timestamp gauge
recon_task_status_metrics_last_updated_timestamp{type="ContainerHealthTask",hostname="localhost"}
1644897761573
recon_task_status_metrics_last_updated_timestamp{type="ContainerKeyMapperTask",hostname="localhost"}
1644896921928
recon_task_status_metrics_last_updated_timestamp{type="FileSizeCountTask",hostname="localhost"}
1644896921932
recon_task_status_metrics_last_updated_timestamp{type="NSSummaryTask",hostname="localhost"}
1644896921919
recon_task_status_metrics_last_updated_timestamp{type="OmDeltaRequest",hostname="localhost"}
1644897522075
recon_task_status_metrics_last_updated_timestamp{type="OmSnapshotRequest",hostname="localhost"}
1644896920719
recon_task_status_metrics_last_updated_timestamp{type="PipelineSyncTask",hostname="localhost"}
1644897762221
recon_task_status_metrics_last_updated_timestamp{type="TableCountTask",hostname="localhost"}
1644896921923
```
## What is the link to the Apache JIRA
https://issues.apache.org/jira/browse/HDDS-6317
## How was this patch tested?
Ran on localhost && CI check
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