[adapters] Expose pipeline process swap usage as a Prometheus metric#6383
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sjhddh wants to merge 1 commit into
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[adapters] Expose pipeline process swap usage as a Prometheus metric#6383sjhddh wants to merge 1 commit into
sjhddh wants to merge 1 commit into
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Add a `process_swap_bytes` gauge to the pipeline process metrics, reporting how much of the process's memory is currently swapped out. A nonzero value tells operators the process is swapping, which degrades performance. On Linux the value is read from the `VmSwap` field of `/proc/self/status` (reported in kB and converted to bytes). On non-Linux platforms, or when the field is unavailable, the metric is omitted rather than reported as a misleading zero. Includes a unit test for the `VmSwap` parser covering the present, missing, zero, and malformed cases. Closes feldera#6382 Signed-off-by: sjhddh <151469562+sjhddh@users.noreply.github.com>
blp
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Jun 3, 2026
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It would be good to update the documentation in |
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Describe Manual Test Plan
Adds a
process_swap_bytesgauge to the pipeline process metrics, reporting how many bytes of the process's memory are currently swapped out. A nonzero value tells operators the process is swapping, which degrades performance, as requested in #6382.On Linux the value is read from the
VmSwapfield of/proc/self/status(reported in kB and converted to bytes). On non-Linux platforms (e.g. macOS), or when the field is unavailable, the metric is omitted rather than reported as a misleading zero — consistent with how the otherprocess_*gauges inprocess_metricsare only emitted when present.Verified locally:
cargo fmt --all --check— cleancargo clippy -p dbsp_adapters— no new warningscargo build -p dbsp_adapters— buildscargo test -p dbsp_adapters --lib server::metrics— 3 passed, incl. the newparse_vm_swapunit test (present / missing / zero / malformedVmSwap).The Linux
/proc/self/statusread path itself was not exercised at runtime (developed on macOS), but theVmSwapparser is unit-tested cross-platform.Closes #6382