fix(env): pass through OpenTelemetry variables

CHANGELOG.md

@@ -1,5 +1,6 @@
 # Changelog
 
+- **Fixed** Cached tasks now receive OpenTelemetry's `OTEL_*` variables, such as `OTEL_EXPORTER_OTLP_ENDPOINT`, so tools that export telemetry from a cached task no longer need `OTEL_*` in every task's `untrackedEnv`. Like the other default pass-through variables, their values are not part of the cache key ([#927](https://github.com/voidzero-dev/vite-task/pull/927)).
 - **Changed** Tasks that write a file they also read are now cached, instead of being reported as `not cached because it modified its inputs`. For example, `tsc --incremental` reads and rewrites `tsconfig.tsbuildinfo`: the next run is a cache hit if the file is as `tsc` left it, or if it is missing, as on a fresh clone, in which case the hit restores it ([#913](https://github.com/voidzero-dev/vite-task/pull/913)).
 - **Fixed** A cache hit restores the symbolic links a task's `output` globs match as links, instead of dropping them, so a replayed output that links a directory, such as a bundler's `node_modules/<package>` link, is complete ([#885](https://github.com/voidzero-dev/vite-task/pull/885)).
 - **Fixed** On Linux and macOS, programs using automatic file-access tracking no longer abort when they call `execve`, `execv`, `execl`, `execle`, or `posix_spawn` with an empty path; the call fails with `ENOENT`, as it does without tracking. On Linux, `execveat` with an empty path and without `AT_EMPTY_PATH` now also fails with `ENOENT`, instead of trying to run what its directory descriptor refers to ([#896](https://github.com/voidzero-dev/vite-task/pull/896)).

crates/vt_graph/src/config/mod.rs

@@ -537,6 +537,8 @@ pub const DEFAULT_UNTRACKED_ENV: &[&str] = &[
     "COMPOSE_*",
     // Playwright specific
     "PLAYWRIGHT_*",
+    // OpenTelemetry SDK settings, such as the exporter endpoint and service name
+    "OTEL_*",
     // Vite+ internal (not fingerprinted — internal state, not build-affecting)
     "VP_*",
     // Token patterns

crates/vt_plan/src/envs.rs

@@ -614,4 +614,22 @@ mod tests {
         assert!(envs.contains_key(EnvName::from_ref(OsStr::new("ACTIONS_ID_TOKEN_REQUEST_TOKEN"))));
         assert!(!envs.contains_key(EnvName::from_ref(OsStr::new("ACTIONS_UNRELATED"))));
     }
+
+    #[test]
+    fn test_opentelemetry_env_untracked() {
+        let env_config = create_env_config(&[], DEFAULT_UNTRACKED_ENV);
+
+        let mut envs = create_test_envs(vec![
+            ("OTEL_EXPORTER_OTLP_ENDPOINT", "http://localhost:4318"),
+            ("OTEL_SERVICE_NAME", "build"),
+            ("OTHER_VAR", "should-be-filtered"),
+        ]);
+
+        let result = EnvFingerprints::resolve(&mut envs, &env_config).unwrap();
+
+        assert!(envs.contains_key(EnvName::from_ref(OsStr::new("OTEL_EXPORTER_OTLP_ENDPOINT"))));
+        assert!(envs.contains_key(EnvName::from_ref(OsStr::new("OTEL_SERVICE_NAME"))));
+        assert!(!envs.contains_key(EnvName::from_ref(OsStr::new("OTHER_VAR"))));
+        assert!(result.fingerprinted_envs.is_empty());
+    }
 }