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feat(perf): add on-demand (ui) throughput to cover pipeline cpm (#947)

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* feat(perf): add on-demand (ui) throughput to cover pipeline cpm

Cover cpm previously measured only the native backfill (lib) via the
cover:library-progress done delta. Add a parallel UI series: every completed
on-demand Rust cover ensure (grid / now-playing) records a timestamp, surfaced
as a covers-per-minute rate. Both are exposed in the live cover diag, shown as
separate Backfill (lib) / On-demand (ui) cards in the Monitor tab (each pinnable
to the overlay) and as lib/ui rows in the Cover pipeline overlay block.

* docs(changelog): note cover on-demand (ui) throughput (PR #947)

Add CHANGELOG entry and credits line for the UI cover cpm metric.

* fix(perf): source on-demand (ui) cpm from backend produced-cover count

The JS ensure-queue counter never tracked: produced covers return hit:true
(only misses/errors are hit:false), and ensure-queue dedup/HMR made client
counting unreliable. Count on-demand covers natively in ensure_inner on the
produce path (non-bulk, past the cache-hit gate), expose a cumulative
uiEnsuredTotal in the pipeline stats, and derive the per-minute rate on the
frontend from polled deltas — mirroring the lib backfill series.

* perf(cover): measure cpm over trailing 5s instead of full minute

A 60s rolling average added too much inertia, flattening real bursts and
stalls in both the lib backfill and on-demand (ui) cover throughput. Compute
the rate from the trailing 5s of samples (still extrapolated to per-minute),
so the figure reacts promptly and decays to 0 within the window when idle.
This commit is contained in:
cucadmuh
2026-06-02 12:11:22 +03:00
committed by GitHub
parent 975bb6d9af
commit 2224ddbe78
14 changed files with 221 additions and 34 deletions
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CHANGELOG.md
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@@ -380,6 +380,12 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
* The cover pipeline now reports a covers-per-minute throughput (cpm), the analogue of the analysis pipeline's tpm: a rolling one-minute rate derived from the backfill `done` progress. Shown in the Monitor tab "Cover backfill" card (pinnable to the overlay) and in the Cover pipeline overlay block.
### Performance Probe — cover pipeline on-demand (ui) throughput
**By [@cucadmuh](https://github.com/cucadmuh), PR [#947](https://github.com/Psychotoxical/psysonic/pull/947)**
* Cover cpm previously measured only the native backfill (lib). On-demand UI cover ensures (grid / now-playing) now report their own covers-per-minute rate, shown as separate **Backfill (lib)** and **On-demand (ui)** cards in the Monitor tab (each pinnable) and as `lib`/`ui` rows in the Cover pipeline overlay block.