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synctv/docs/src
zijiren 2445da8630
refactor(metrics): centralize registry and lifecycle tracking (#446)
## Summary

- split Prometheus definitions into domain-owned modules backed by one
registry
- eagerly initialize every metric family and fail startup on invalid or
duplicate definitions
- add reusable RAII guards for gauges and relay durations across
cancellation, panic, and retry paths
- centralize HTTP, WebSocket, gRPC, and relay recording behind
bounded-label helpers
- enforce the 65-metric bilingual catalog from registered descriptors
- persist completed explicit-message deletion and user-ban moderation
steps
- update the pinned Rust toolchain and CI jobs to `nightly-2026-08-25`
- make the CI Clippy job fail on every Rust warning with `-D warnings`
- keep Helm configuration-validation builds visible to avoid silent-run
termination
- separate Rust caches by artifact type and let Helm reuse codegen
artifacts from the Build job
- work around the nightly global next-solver memory regression and
remove obsolete rustc recursion-limit overrides
- preserve workspace Rust flags in Docker builds while applying linker
flags to the final binary

## Compatibility

- preserve all existing metric names, HELP text, label order, and
histogram buckets
- keep route-template and bounded status/error labels
- return HTTP 500 when Prometheus exposition encoding fails
- keep the latest nightly while restoring the previous coherence-only
trait-solver behavior

## Nightly memory regression

The failed CI jobs were terminated by the runner while compiling
`synctv-api-http` (SIGTERM, exit 143). Local peak-RSS measurements for
that crate were:

| Configuration | Peak RSS |
| --- | ---: |
| `nightly-2026-08-21` | 6.62 GB |
| `nightly-2026-08-25`, global next solver | 10.76 GB |
| `nightly-2026-08-25`, `-Znext-solver=coherence` | 6.64 GB |

Rust enabled `-Znext-solver=globally` by default on nightly in
[rust-lang/rust#160619](https://github.com/rust-lang/rust/pull/160619).
The same memory blow-up is tracked in
[rust-lang/rust#161748](https://github.com/rust-lang/rust/issues/161748),
and the official tracking issue documents `-Znext-solver=coherence` as
the temporary opt-out. The workspace now applies that option in
`.cargo/config.toml`.

The Dockerfile previously set `RUSTFLAGS` for linker options, which
overrode the workspace configuration and re-enabled the global solver
inside image builds. It now uses `cargo rustc` to pass linker flags only
to the final binary, preserving the workspace solver setting for every
crate.

All rustc `#![recursion_limit = "256"]` attributes were removed. The
default limit passes with the coherence-only solver, confirming that a
higher recursion limit was unrelated to the CI termination.

## Validation

- `make build-workspace`
- `make clippy-check` (`--workspace --all-targets -- -D warnings`)
- `cargo check --locked -p synctv-api-http`
- `cargo check --locked -p synctv-api-common -p synctv-api-grpc`
- `cargo test -p synctv-api-common --lib` (655 passed, 165 Docker tests
ignored)
- `cargo test -p synctv-core metrics --lib` (9 passed)
- `make fmt-check`
- `docker build --check .`
- `make validate-helm`
- `actionlint .github/workflows/ci.yml .github/workflows/helm-ci.yml`
- `npm run validate` in `docs` (124 pages, 353 links, Astro 0
errors/warnings)
4 weeks ago
..
assets/diagrams chore: replace synctv-org backend with SyncTV v1.0.0 2 months ago
components fix(docs): preserve TAR end-of-archive blocks (#389) 2 months ago
content/docs refactor(metrics): centralize registry and lifecycle tracking (#446) 4 weeks ago
diagrams chore: replace synctv-org backend with SyncTV v1.0.0 2 months ago
lib release: prepare v1.0.3 (#430) 1 month ago
styles chore: replace synctv-org backend with SyncTV v1.0.0 2 months ago
types fix(docs): package Compose environment files as TAR (#388) 2 months ago
content.config.ts chore: replace synctv-org backend with SyncTV v1.0.0 2 months ago