HDDS-11512. Create Grafana dashboard for tracking system wide deletion

[Tejaskriya]

What changes were proposed in this pull request?

A system-wise deletion dashboard to track deletion progress is created in this PR. The existing dashboard is updated to include the below metrics:
SCM:
Deletion commands:

• No. of commands sent (numBlockDeletionCommandSent)
• No. of commands successful (numBlockDeletionCommandSuccess)
• No. of commands failed (numBlockDeletionCommandFailure)

Delete transactions:

• No. of transactions created (numBlockDeletionTransactionCreated)
• No. of transactions sent (numBlockDeletionTransactionSent)
• No. of transactions completed (numBlockDeletionTransactionCompleted)
• No. of transactions successful (numBlockDeletionTransactionSuccess)
• No. of transactions failed (numBlockDeletionTransactionFailure)
• No. of transactions skipped (numSkippedTransactions)
• Success percentage of delete (numBlockDeletionTransactionSuccess/numBlockDeletionTransactionSent*100)

DN:

• No. of transactions received (receivedTransactionCount)
• No. of successful transactions (block_deleting_service_metrics_processed_transaction_success_count)
• No. of bytes successfully deleted (successBytes)
• No. of block deletion request received (receivedBlockCount)
• No. of blocks chosen for deletion (totalBlockChosenCount)
• No. of blocks successfully deleted (successCount)
• No. of blocks pending for processing (totalPendingBlockCount)
• Success percentage of delete (successCount/receivedBlockCount*100)

OM:
KeyDeletion service:

• Deleting_service_metrics_num_keys_processed
• Deleting_service_metrics_num_keys_sent_for_purge

DirectoryDeletingService:

• Deleting_service_metrics_num_dirs_sent_for_purge
• Deleting_service_metrics_num_sub_files_sent_for_purge
• Deleting_service_metrics_num_sub_dirs_sent_for_purge

PurgeRequest:

• Deleting_service_metrics_num_keys_purged
• Deleting_service_metrics_num_dirs_purged
• Deleting_service_metrics_num_sub_files_moved_to_deleted_table
• Deleting_service_metrics_num_sub_dirs_moved_to_deleted_dir_table

OpenKeyDeletion:

• Om_metrics_num_open_keys_deleted
• Om_metrics_num_open_keys_cleaned
• Om_metrics_num_open_keys_h_sync_cleaned
• Om_metrics_num_open_key_delete_requests
• Om_metrics_num_open_key_delete_request_fails

What is the link to the Apache JIRA

https://issues.apache.org/jira/browse/HDDS-11512

How was this patch tested?

Grafana with docker:

[aryangupta1998]

Thanks for the patch @Tejaskriya, LGTM!

[ashishkumar50]

@Tejaskriya Thanks for the patch, pls find comments below:

1. OpenKeyDeletion: KeysDeleted and KeysCleaned, do we need two dashboards here? what is the difference?
2. DataNode graph, Y-axis is wrong in "No of bytes successfully deleted".
3. SCM graph, Y-axis names are missing in "No of deletion transactions created" , "No of failed deletion transactions".