rdhabalia opened a new pull request #8928:
URL: https://github.com/apache/pulsar/pull/8928
### Motivation
Pulsar stats reports an incorrect backlog for topic subscription and it also
shows the discrepancy between topic stats and stats-internal. Below example
shows that subs doesn't have any backlog but still stats shows backlog. So,
topic-stats should capture precise backlog to avoid capturing invalidate data.
```
stats:
"sub-1" : {
"msgRateOut" : 0.0,
"msgThroughputOut" : 0.0,
"msgRateRedeliver" : 0.0,
"msgBacklog" : 1150,
"blockedSubscriptionOnUnackedMsgs" : false,
"msgDelayed" : 0,
stats-internal:
"sub-1" : {
"markDeletePosition" : "546417:690",
"readPosition" : "546417:691",
"waitingReadOp" : true,
"pendingReadOps" : 0,
"messagesConsumedCounter" : 127360,
"cursorLedger" : 546425025,
"cursorLedgerLastEntry" : 18,
"individuallyDeletedMessages" : "[]",
"lastLedgerSwitchTimestamp" : "2020-08-19T21:48:06.307Z",
"state" : "Open",
"numberOfEntriesSinceFirstNotAckedMessage" : 1,
"totalNonContiguousDeletedMessagesRange" : 0,
"properties" : { }
```
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