envoyproxy/envoy

tracing: revisit perf implication of many trace tags

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#9653 aperta il 10 gen 2020

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area/perfarea/tracinghelp wanted

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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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