Rahul Rane

Sharing existing zkClient instead of creating new one while creating DryrunWagedRebalancer

1

### Describe the bug Currently every time a calcBestPossState is called for any verify event, while creating DryrunWagedRebalancer we just pass metadataStoreAddresses from zkClient object and create a new zkClient...

### Describe the bug Helix Architecture page looks broken. It doesn't open in correct format and also do not show any architecture content. Page link : https://helix.apache.org/Architecture.html ### To Reproduce...

Current raw client doesn't expose reverse scan public API. Add a public API and necessary plumbing for it.

Reporting top state handoff time even if it's beyond threshold value

2

### Describe the bug In TopStateHandoffReportStage, when top state is detected in this stage and helix has previous missing top state record ([code pointer](https://github.com/apache/helix/blob/e307aa91f9782e82edfa6259d053ca079cbda7c9/helix-core/src/main/java/org/apache/helix/controller/stages/TopStateHandoffReportStage.java#L212)), helix finds out startTime and endTime...