The ES persistence execution is now asynchronous and the execution
latency only counts the time to insert the requests into the bulk
processor, instead of the time after the requests are flushed into the
storage, this patch fixes that issue.

There is the same issue in prepare latency but that needs more changes
so I'll leave it to another pull request.

* Change `SO11Y` metric `envoy_als_in_count` to calculate the ALS message count.

Optimize metrics of minute dimensionality persistence, don't save metric of being default value. (#8066)

Optimize metrics of minute dimensionality persistence.
- The value of metrics, which has declaration of the default value and current value equals the default value logically, the whole row wouldn't be pushed into database.
- Add self-observability `metrics_persistence_skipped` metric to measure the number of skipped metrics.
- SLA(percent function), Apdex, AvgLong(MAL mostly) metrics are mostly optimized because of this. Such as a full-failing error(0% successful rate) and unhealthy(apdex=0) are not costing the storage.
- Hour/Day dimensionalities metrics are not changed, as they cover long duration.
- Fix `max` function in OAL doesn't support negative long.

1. Remove general receiver and fetcher docs
1. Add more specific menu with docs to help users to find documents easier.

Co-authored-by: Nyuzhongyu <yuzhongyu@cestc.cn>

Fix ElasticSearch implementation of `queryMetricsValues` and `readLabeledMetricsValues` doesn't fill default values (#8012)

* Fix ElasticSearch implementation of `queryMetricsValues` and `readLabeledMetricsValues` doesn't fill default values
* Change generated file path.

Add a GraphQL query to get OAP version, display OAP version in startup message and error logs (#8004)