envoyproxy / envoyproxy/envoy

tracing: revisit perf implication of many trace tags

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area/perf area/tracing help wanted
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Description

We have an increasing amount of trace tags that we emit without any configuration. We should try to profile the cost of doing these tags, especially if there is no tracing configured (null tracer). We should potentially allow for the emitted tags to be configured in high perf scenarios.

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