[Serve][7/n] Add long poll metrics#59246
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Signed-off-by: abrar <abrar@anyscale.com>
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This pull request adds metrics for the long poll mechanism, including end-to-end propagation latency and the number of pending clients. The changes look good and are well-tested. I've suggested a couple of minor improvements to increase the accuracy of the latency measurements by moving the timestamp acquisition inside the processing loops. Overall, this is a great addition for monitoring and observability.
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fixes #59218