HTTP health check filter depends on stats
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area/health_checking
area/stats
bug
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Description
*Title*: *HTTP health check filter depends on stats*
*Description*:
The [HTTP health check filter](https://github.com/envoyproxy/envoy/blob/d7b10e8d1e782e7284e2cb7e4a83b6525b6a8f05/source/extensions/filters/http/health_check/health_check.cc#L146-L166) relies on the presence of the following stats: `membership_total`, `membership_healthy`, and `membership_degraded`. Running a configuration that filters out these stats will cause the filter to not work properly. Like #9856, this falls into the category of using stats for control flow.
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