* [**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)
```
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