haoyuhua

Signed-off-by: ## Pre-Checklist Note: Please complete **_ALL_** items in the following checklist. - [x] I have read through the [CONTRIBUTING.md](https://github.com/bytedance/bitsail/blob/master/docs/contributing.md) documentation. - [x] My code has the necessary comments and...

### Title: [BitSail][Doc] Add metrics document and grafana dashboard template. ### Motivation - Add metrics document. - Provide a grafana dashboard template.

# Connector Development No | Connector | priority | difficulty | Reader/Writer | Contributer | Status | Issue/PR -- | -- | -- | -- | -- | -- |...

Signed-off-by: ## Pre-Checklist Note: Please complete **_ALL_** items in the following checklist. - ✅ I have read through the [CONTRIBUTING.md](https://github.com/bytedance/bitsail/blob/master/docs/contributing.md) documentation. - ✅ My code has the necessary comments and...