[tailsamplingprocessor] Fix the decision timer metric to measure > 50ms #37722
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…er latencies beyond 50ms. Previously the decision timer metric was in microseconds. Because the max histogram bucket was 50000, it capped the maximum measurable latency at 50ms. This commit changes the metric to be in milliseconds, which allows for measuring latencies of up to 50 seconds. Since the default decision tick is 1s, it's necessary to observe when the latency is approaching 1s. I'm not sure how big of a breaking change it is to update the unit, but given the previous value was not super useful, I thought it was better to change it.
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Description
Previously the decision timer metric was in microseconds. Because the max histogram bucket was 50000, it capped the maximum measurable latency at 50ms. This commit changes the metric to be in milliseconds, which allows for measuring latencies of up to 50 seconds.
Since the default decision tick is 1s, it's necessary to observe when the latency is approaching 1s.
I'm not sure how big of a breaking change it is to update the unit, but given the previous value was not super useful, I thought it was better to change it.
Here's an example of the current state:
Notice how the average latency is running much higher than the p99, indicating that we are missing important data on how slow the decision tick actually is.