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https://issues.apache.org/jira/browse/CAMEL-23976?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Claus Ibsen reassigned CAMEL-23976:
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Assignee: Claus Ibsen
> Add percentile latency statistics (p50/p95/p99) to Extended management
> statistics
> ---------------------------------------------------------------------------------
>
> Key: CAMEL-23976
> URL: https://issues.apache.org/jira/browse/CAMEL-23976
> Project: Camel
> Issue Type: Improvement
> Components: camel-management
> Reporter: Claus Ibsen
> Assignee: Claus Ibsen
> Priority: Major
> Fix For: 4.22.0
>
>
> Currently Camel's ManagedPerformanceCounter only tracks min, max, and mean
> processing time. For monitoring and troubleshooting, percentile latencies
> (p50, p95, p99) are much more useful than mean — they reveal tail latency
> that averages hide.
> *Proposal:* when ManagementStatisticsLevel is set to Extended, allocate a
> sliding-window ring buffer (long[1024]) in ManagedPerformanceCounter to
> record recent processing times. On each completedExchange(), write the
> processing time into the buffer (single array write — negligible overhead).
> Expose new MBean methods for p50, p95, p99 that sort the buffer on demand
> when queried.
> *Key design points:*
> - Only enabled when statisticsLevel=Extended — zero overhead for
> Default/RoutesOnly/Off
> - Sliding window of last 1024 exchanges gives exact percentiles over recent
> activity (no approximation)
> - ~8KB memory per route/processor (1024 longs) — negligible
> - No external dependency needed (no HDRHistogram library)
> - Methods return -1 when Extended is not enabled
> - The sliding window approach fits live monitoring use cases (TUI, dev
> console) where "what's happening now" matters more than lifetime cumulative
> percentiles
> *Changes needed:*
> - ManagedPerformanceCounterMBean: add getProcessingTimeP50/P95/P99 methods
> - ManagedPerformanceCounter: add ring buffer, write in completedExchange(),
> implement percentile computation
> - Dev console / TUI can then display these values
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