*: Using native histograms for grpc middleware metrics (thanos-io#7393)

* *: Using native histograms for grpc middleware metrics

Since we updated the middleware library, we can now use native histograms to keep track of latencies in grpc calls.
This is a semi-breaking change if people enabled native histogram collection on their Prometheus monitoring Thanos instances.

Signed-off-by: Pedro Tanaka <pedro.stanaka@gmail.com>

adding change log

Signed-off-by: Pedro Tanaka <pedro.tanaka@shopify.com>

* removing empty space;

Signed-off-by: Pedro Tanaka <pedro.tanaka@shopify.com>

* Put full disclaimer in changelog

Signed-off-by: Pedro Tanaka <pedro.tanaka@shopify.com>

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Signed-off-by: Pedro Tanaka <pedro.tanaka@shopify.com>

CHANGELOG.md

@@ -28,6 +28,7 @@ We use *breaking :warning:* to mark changes that are not backward compatible (re
 
 - [#7334](https://github.com/thanos-io/thanos/pull/7334) Compactor: do not vertically compact downsampled blocks. Such cases are now marked with `no-compact-mark.json`. Fixes panic `panic: unexpected seriesToChunkEncoder lack of iterations`.
 - [#7382](https://github.com/thanos-io/thanos/pull/7382) *: Ensure objstore flag values are masked & disable debug/pprof/cmdline
+- [#7393](https://github.com/thanos-io/thanos/pull/7393) *: *breaking :warning:* Using native histograms for grpc middleware metrics. Metrics `grpc_client_handling_seconds` and `grpc_server_handling_seconds` will now be native histograms, if you have enabled native histogram scraping you will need to update your PromQL expressions to use the new metric names.
 
 ### Removed