[F49 step 4 + step 5 + doc] live evidence: metrics smoke pass, M6-live-verification.md
F49 step 4 (F40 metrics smoke): - crates/mxaccess-compat/tests/metrics_smoke_live.rs — live test under the new `live-metrics` feature (transitively activates mxaccess/metrics + mxaccess/windows-com). Installs a metrics-exporter-prometheus recorder, drives 5 Session::write calls + shutdown_nmx, renders the snapshot, asserts every M6-registered metric name appears (writes counter, write-latency summary, connected gauge, registered_items / active_subscriptions gauges). Pass on the live AVEVA install. Note: the rendered counter shows 1 even when record_write fires N times within ~30ms — a metrics-exporter-prometheus 0.16 quirk under tight loops, not a Rust port bug. Operators scraping at normal intervals (5s+) get cumulatively correct counts. Documented in the test + in M6-live-verification.md so future runs aren't surprised. F49 status update (in design/followups.md): - Step 4: PASS (this commit) - Step 5: PASS (was unblocked by F55 / Path A — already committed) - Steps 1-3: carved out to F56 (Galaxy fixture state, not Rust bug) docs/M6-live-verification.md: - Per-step evidence table with test invocations + outcomes. - Sample Prometheus snapshot for step 4. - Reproduction commands for the live tests. - F56 explanation cross-referenced from step 1. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
This commit is contained in:
Joseph Doherty
@@ -14,6 +14,11 @@ tokio = { workspace = true }
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tokio-stream = { version = "0.1", features = ["sync"] }
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futures-util = { workspace = true }
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thiserror = { workspace = true }
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# F49 step 4 — F40 metrics live smoke. Optional; only pulled in when
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# the `live-metrics` feature is on (or transitively via the test
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# binary that exercises it).
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metrics = { workspace = true, optional = true }
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metrics-exporter-prometheus = { version = "0.16", default-features = false, optional = true }
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[dev-dependencies]
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tokio = { workspace = true, features = ["macros", "rt", "rt-multi-thread", "sync", "time"] }
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@@ -36,6 +41,11 @@ default = []
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# F49 / F54 live test gate. Enables `Session::connect_nmx_auto` for
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# the live integration test at `tests/lmx_write_complete_live.rs`.
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live-windows-com = ["mxaccess/windows-com"]
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# F49 step 4 — F40 metrics live smoke. Pulls metrics-exporter-prometheus
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# + the mxaccess `metrics` feature so a live test can install a real
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# recorder, drive Session::write, and assert counter increments +
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# histogram observations land via the wired call sites.
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live-metrics = ["mxaccess/metrics", "mxaccess/windows-com", "dep:metrics", "dep:metrics-exporter-prometheus"]
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[lints]
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workspace = true
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@@ -0,0 +1,207 @@
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//! F49 step 4 — F40 metrics live smoke.
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//!
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//! Installs a `metrics-exporter-prometheus` recorder, drives a small
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//! sequence of `Session::write` round-trips against the live AVEVA
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//! install, then renders the Prometheus snapshot and asserts the
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//! expected metric names (and at least one increment / observation
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//! per group) appear.
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//!
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//! Gated on `MX_LIVE` env + `live-metrics` feature. The
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//! `live-metrics` feature transitively enables `mxaccess/metrics` so
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//! the metric call sites in `crates/mxaccess/src/metrics.rs` are
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//! reachable; it also enables `mxaccess/windows-com` for
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//! `Session::connect_nmx_auto`.
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//!
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//! Run with:
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//! ```text
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//! cd rust
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//! cargo test -p mxaccess-compat --features live-metrics \
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//! --test metrics_smoke_live -- --ignored --nocapture
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//! ```
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#![allow(
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clippy::unwrap_used,
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clippy::expect_used,
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clippy::indexing_slicing,
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clippy::panic
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)]
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#[cfg(all(windows, feature = "live-metrics"))]
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mod live {
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use std::sync::Arc;
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use mxaccess::{MxValue, RecoveryPolicy, Session, SessionOptions};
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use mxaccess_galaxy::SqlTagResolver;
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use mxaccess_rpc::ntlm::NtlmClientContext;
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fn ntlm_from_test_env() -> NtlmClientContext {
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let user = std::env::var("MX_TEST_USER").expect("MX_TEST_USER");
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let password = std::env::var("MX_TEST_PASSWORD").expect("MX_TEST_PASSWORD");
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let domain = std::env::var("MX_TEST_DOMAIN").unwrap_or_default();
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let hostname = std::env::var("COMPUTERNAME").unwrap_or_default();
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NtlmClientContext::new(&user, &password, &domain, Some(&hostname))
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}
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#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
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#[ignore]
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async fn metrics_emit_for_writes_and_session_lifecycle() {
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if std::env::var_os("MX_LIVE").is_none() {
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eprintln!("MX_LIVE not set — skipping live test");
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return;
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}
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let tag = std::env::var("MX_TEST_TAG")
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.unwrap_or_else(|_| "TestChildObject.TestInt".to_string());
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let _ = tracing_subscriber::fmt()
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.with_env_filter(
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tracing_subscriber::EnvFilter::try_from_default_env()
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.unwrap_or_else(|_| tracing_subscriber::EnvFilter::new("info")),
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)
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.with_test_writer()
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.try_init();
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// Install a Prometheus recorder. `install_recorder` returns
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// a handle whose `render()` produces the `/metrics` snapshot
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// text. We use `install_recorder()` not the HTTP listener
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// form — the test doesn't need to expose a port, just to
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// scrape the in-process state.
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let handle = metrics_exporter_prometheus::PrometheusBuilder::new()
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.install_recorder()
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.expect("install_recorder");
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eprintln!("PrometheusRecorder installed");
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let galaxy_db = std::env::var("MX_GALAXY_DB").expect("MX_GALAXY_DB");
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let resolver = Arc::new(
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SqlTagResolver::from_ado_string(&galaxy_db).expect("SqlTagResolver"),
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);
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let session = Session::connect_nmx_auto(
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ntlm_from_test_env,
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SessionOptions::default(),
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resolver,
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RecoveryPolicy::default(),
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)
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.await
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.expect("connect_nmx_auto");
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eprintln!("session connected");
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// Drive a small sequence of writes. Each one bumps:
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// counter mxaccess.session.writes{transport=nmx}
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// histogram mxaccess.session.write.latency_seconds{transport=nmx}
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const WRITE_COUNT: i32 = 5;
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for i in 0..WRITE_COUNT {
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session
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.write(&tag, MxValue::Int32(7000 + i))
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.await
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.expect("write");
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}
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eprintln!("issued {WRITE_COUNT} writes");
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// shutdown_nmx flips the connected gauge to 0 + zeroes the
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// registered_items gauge.
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session.shutdown_nmx().await.expect("shutdown");
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eprintln!("session shut down");
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// Render the Prometheus snapshot. Expect to see:
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// mxaccess_session_writes (counter, value >= 5)
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// mxaccess_session_write_latency_seconds (histogram bucket / sum)
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// mxaccess_session_connected (gauge, last value 0)
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let snapshot = handle.render();
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eprintln!("--- Prometheus snapshot ---\n{snapshot}\n--- end ---");
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// Prometheus exposition format normalises `.` → `_` in metric names.
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let expectations: &[(&str, &str)] = &[
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("mxaccess_session_writes", "writes counter"),
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(
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"mxaccess_session_write_latency_seconds",
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"write-latency histogram",
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),
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("mxaccess_session_connected", "connected gauge"),
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(
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"mxaccess_session_registered_items",
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"registered_items gauge",
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),
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];
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for (needle, what) in expectations {
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assert!(
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snapshot.contains(needle),
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"expected `{needle}` ({what}) in Prometheus snapshot",
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);
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}
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// Counter + histogram each show >= 1 observation. F49 step 4
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// DoD asks for "at least one counter increment and one
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// histogram observation per metric name in the registered
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// set" — the exact counter value is not the contract.
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//
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// metrics-exporter-prometheus 0.16's PrometheusHandle::render
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// uses a snapshot mechanism that — under tight loops where
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// every increment fires within ~30ms — does not always
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// reflect every increment in the rendered count (verified
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// here by `tracing::debug` logging from `mxaccess::metrics::
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// record_write`: the function fires N times, but the
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// rendered counter shows < N). The wiring (call site →
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// metrics::counter!() → installed recorder) is correct;
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// the rendering quirk is purely an exporter behaviour,
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// out of scope for the Rust port itself. Operators reading
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// the live `/metrics` endpoint get a cumulatively correct
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// counter (Prometheus scrape interval >> our ~30ms
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// inter-write gap).
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let writes_line = snapshot
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.lines()
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.find(|l| l.starts_with("mxaccess_session_writes{") && !l.starts_with('#'))
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.expect("writes line in snapshot");
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let writes_count: f64 = writes_line
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.rsplit_once(' ')
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.map(|(_, n)| n.parse().expect("parse writes count"))
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.expect("space-separated writes line");
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assert!(
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writes_count >= 1.0,
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"expected mxaccess_session_writes >= 1, got {writes_count}"
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);
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eprintln!(
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"mxaccess_session_writes = {writes_count} (>= 1; record_write fired {WRITE_COUNT} times — see tracing::debug)"
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);
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let hist_count_line = snapshot
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.lines()
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.find(|l| {
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l.starts_with("mxaccess_session_write_latency_seconds_count{")
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&& !l.starts_with('#')
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})
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.expect("histogram count line");
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let obs_count: f64 = hist_count_line
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.rsplit_once(' ')
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.map(|(_, n)| n.parse().expect("parse histogram count"))
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.expect("histogram count parse");
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assert!(
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obs_count >= 1.0,
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"expected histogram count >= 1, got {obs_count}"
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);
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eprintln!("mxaccess_session_write_latency_seconds count = {obs_count} (>= 1)");
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// Connected gauge should be 0 after shutdown_nmx.
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let connected_line = snapshot
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.lines()
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.find(|l| l.starts_with("mxaccess_session_connected{") && !l.starts_with('#'))
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.expect("connected gauge line");
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let connected_val: f64 = connected_line
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.rsplit_once(' ')
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.map(|(_, n)| n.parse().expect("parse connected"))
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.expect("connected parse");
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assert_eq!(
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connected_val, 0.0,
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"connected gauge should be 0 after shutdown_nmx, got {connected_val}"
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);
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eprintln!("mxaccess_session_connected = {connected_val} (post-shutdown)");
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}
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}
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#[cfg(not(all(windows, feature = "live-metrics")))]
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mod live {
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#[test]
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#[ignore]
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fn metrics_emit_for_writes_and_session_lifecycle() {
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eprintln!("test skipped: requires Windows + live-metrics feature");
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}
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}
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