* [**Breaking Change**]: Remove prometheus-fetcher plugin, please use OpenTelemetry to scrape Prometheus metrics and
   set up SkyWalking OpenTelemetry receiver instead.
 * BugFix: histogram metrics sent to MAL should be treated as OpenTelemetry style, not Prometheus style:
   ```
   (-infinity, explicit_bounds[i]] for i == 0
   (explicit_bounds[i-1], explicit_bounds[i]] for 0 < i < size(explicit_bounds)
   (explicit_bounds[i-1], +infinity) for i == size(explicit_bounds)
   ```

* [**Breaking Change**] Support sharding MySQL database instances and tables by [Shardingsphere-Proxy](https://shardingsphere.apache.org/document/current/en/overview/#shardingsphere-proxy).
  SQL-Database requires removing tables `log_tag/segment_tag/zipkin_query` before OAP starts, if bump up from previous releases.

* Fix meter functions `avgHistogram`, `avgHistogramPercentile`, `avgLabeled`, `sumHistogram` having data conflict when downsampling. FYI @jinho-son thanks for reporting.
* Do sorting `readLabeledMetricsValues` result forcedly in case the storage(database) doesn't return data consistent with the parameter list.

Co-authored-by: 吴晟 Wu Sheng <wu.sheng@foxmail.com>