viirya opened a new pull request, #7:
URL: https://github.com/apache/spark-connect-gateway/pull/7
### What changes were proposed in this pull request?
Part of importing the Spark Connect Gateway reference implementation into
`apache/spark-connect-gateway` as a series of small, bottom-up PRs (tracked
in
the do-not-merge reference PR #1).
This adds the `scg-observability` crate — the metrics, tracing, and admin
surface for the gateway:
- Prometheus metrics for the gateway
- Distributed tracing — an OpenTelemetry exporter with W3C traceparent
propagation
- An admin HTTP server exposing `/metrics`, `/healthz`, and `/readyz`
`scg-observability` is a leaf crate (no internal dependencies), so it
compiles
and tests on its own (8 unit tests). It is appended to the workspace
`members`
list, and is consumed later by the `proxy` and `gateway` crates.
### Why are the changes needed?
Implements the reference gateway from the approved SPIP (SPARK-58455),
imported
one reviewable piece at a time.
### Does this PR introduce _any_ user-facing change?
No.
### How was this patch tested?
`cargo fmt --all --check`, `cargo clippy --workspace --all-targets -- -D
warnings`,
`cargo build --workspace`, and `cargo test --workspace` all pass locally
(scg-observability has 8 unit tests).
### Was this patch authored or co-authored using generative AI tooling?
Yes, co-authored with Claude Code.
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