Add a metric that exposes IO thread utilization#192
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This allows to spot issues where evcache is overloaded and supports some basic prediction of whether an instance might become overloaded with a significant traffic increase or whether the thread pool could be tuned.
akhaku
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May 15, 2026
| if (cpuNs < 0L) { | ||
| if (!negativeCpuTimeLogged) { | ||
| negativeCpuTimeLogged = true; | ||
| log.warn("Thread CPU time returned a negative value; skipping EVCache loop CPU utilization publish"); |
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I'm a little confused as to what we're measuring in this PR - is this different from looking the values reported for CPU time on a thread dump?
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Yes, that's exactly it. Exposing this as a metric allows us to look at it easily and assess this as a potential tuning/hotspot if we move a client to a larger instance type (e.g. will 2x the traffic lead to congestion at evcache client).
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This allows to spot issues where evcache is overloaded and supports some basic prediction of whether an instance might become overloaded with a significant traffic increase or whether the thread pool could be tuned.