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test: cover prometheus_mp's scrape output like the single-process exporter's - #2400
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Check name Status Explanation Title check The title clearly identifies the main change: adding test coverage for Prometheus multi-process scrape output. It is concise and specific. Description check The description includes the required What, Why, and optional How sections. It explains the test coverage, motivation, implementation differences, and reported validation results. Linked Issues check Check skipped because no linked issues were found for this pull request. Out of Scope Changes check Check skipped because no linked issues were found for this pull request.
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Review comments at @test/gtest/telemetry_mp_scrape_test.cpp:
- Around line 99-100: Update the lone-agent assertion in the test so it inspects
every agent_tx_bytes_total series for agent_name and rejects any series for that
agent containing pid or agent_instance. Preserve the existing requirement that
the expected tx_series is present.
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…orter's Port the single-process Prometheus scrape, histogram and stress cases that are still worth keeping to prometheus_mp, so this coverage survives when NIX-2062 removes the single-process exporter and its tests. Add a mock telemetry plugin whose exporter throws nixlTelemetryBindFailed, so nixlTelemetry::create's run-without-a-sink path stays covered once no real exporter throws it. Signed-off-by: Efraim Eygin <eeygin@nvidia.com>
Clear NIXL_TELEMETRY_RANK_ENV as well as LOCAL_RANK, since either can add a local_rank label, and reject pid and agent_instance on every series of the lone agent's scrape rather than only on the series looked up. Signed-off-by: Efraim Eygin <eeygin@nvidia.com>
Four test files now name MpExporterTest, and the scrape and stress tests load the plugin by name as well as LoadsThroughPluginManager does. Signed-off-by: Efraim Eygin <eeygin@nvidia.com>
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🤖 CI Triage Agent — TL;DR: Full analysisSummary: Stage "Run DL Python tests" (node 240) failed: Root cause: Both spawned workers died inside the local overload of (rank 1 identical with
This has nothing to do with the change under test: branch Implicated commit: [REDACTED:Hex High Entropy String] — x41lakazam, "BINDINGS/PYTHON: Expose prepMemView (local + remote overloads)" (#1715), which added File: Suggested fix:
Related: PR #2400 (the PR under test, unrelated to the failure); PR #2194 "bugfix: test: make the device API tests actually run" (same device-API test-enablement area, likely the right place to land the gating fix); PR #1715 (added the failing test).
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) ## What? `prometheus_mp` no longer requires `NIXL_TELEMETRY_MULTIPROC_DIR`. When it is unset or empty, the directory defaults to `/dev/shm/nixl-telemetry-<euid>-<port>` (under the system temp directory when `/dev/shm` is not writable) and the chosen path is logged at INFO. Processes of one user that share `NIXL_TELEMETRY_PROMETHEUS_PORT` are then aggregated behind that port with no other configuration. If the default directory cannot be used, for example because another user took the name first, the process warns and runs without telemetry instead of failing agent construction. An explicit directory still wins and stays fatal. ## Why? [NVBug 6575930](https://nvbugspro.nvidia.com/bug/6575930): TensorRT-LLM with `--tp_size 2` under Dynamo runs two NIXL processes with `NIXL_TELEMETRY_EXPORTER=prometheus`, one port and no directory; older releases crash and v1.5.0 exports one process. [NIX-2062](https://linear.app/nvidia/issue/NIX-2062) makes `prometheus` load `prometheus_mp`, but `prometheus_mp` throws out of the `nixlAgent` constructor when the directory is unset. This is one of three NIX-2062 PRs, alongside the test-only #2400; the last one adds the alias and removes the single-process exporter. ## How? <details> <summary>Behaviour, tests, docs</summary> - Only an unset or empty variable gets the default. The port comes from the same `NIXL_TELEMETRY_PROMETHEUS_PORT` lookup as the bind address, so processes configured with different ports keep separate endpoints. Unrelated jobs of one user on one port share the directory too; the README says to give concurrent jobs different ports. - An explicit directory behaves as before: it is created `0700`, a foreign owner or a group/world-writable mode warns, and one that cannot be created throws. The default directory differs in one way: when it cannot be created, or the store cannot be created in it, the exporter throws `nixlTelemetryBindFailed`, so `nixlTelemetry::create` warns once and returns null. `storeWriter` now throws a dedicated `storeSetupError` for its OS failures, which is all the exporter catches, so configuration errors such as an over-long bucket list stay fatal. It also reserves its file with `posix_fallocate` instead of `ftruncate`, so a full `/dev/shm` fails store creation with `ENOSPC` instead of raising `SIGBUS` on the first write. The `nixlTelemetryBindFailed` and `nixlTelemetry::create` API docs now name that case next to the bind one. - The default aggregates only processes of one user that see the same `/dev/shm` (or, on the temp-dir fallback, resolve the same temp directory): always within one container, and across a pod's containers unless one mounts its own `/dev/shm`. Containers that share a network namespace but not `/dev/shm` need an explicit shared directory; without one, the first to bind exports its own processes and the others warn, with no crash. Tests: - `MpExporterTest.EmptyMultiprocDirDefaultsToAPerUserPerPortDir` replaces `MpExporterStandaloneTest.MissingMultiprocDirThrows`: the store lands in the default directory for the fixture's port, created `0700`, and `TearDown` removes it. - `MpExporterTest.UncreatableMultiprocDirThrows`: an explicit directory under a regular file still throws. - `MpExporterTest.SquattedDefaultDirRunsWithoutTelemetry`: a regular file at the default name makes `nixlTelemetry::create` return null with one warning. - `MpExporterTest.OverlongBucketListStaysFatalWithTheDefaultDir` and `MpStoreTest.OsFailureThrowsStoreSetupError`: only OS failures degrade. - `MpE2ETest.RanksConfiguredWithOnlyAPortAggregateBehindIt`: two forked processes that set only `NIXL_TELEMETRY_ENABLE`, `NIXL_TELEMETRY_EXPORTER=prometheus_mp` and the port each create their telemetry through `nixlTelemetry::create`, and one scrape shows one `agent_tx_bytes_total` series per process. A follow-up switches the id to `prometheus`. - Each new case fails against its own mutation and only that one; with the exporter change reverted, the default-path and e2e cases fail. Docs: the `prometheus_mp` README (the default, sharing across jobs and containers, the stores left behind, the shared-host caveat), `docs/telemetry.md`, and fern rows for `NIXL_TELEMETRY_MULTIPROC_DIR`, `NIXL_TELEMETRY_RANK_ENV` and `NIXL_TELEMETRY_MP_STALE_TTL`. Tested on debug and TSan builds with `--gtest_filter=Mp*:prometheusTelemetryTest.*:histogramBucketsTest.*:telemetryTest.*:telemetryStressTest.*:LoadedPluginTestFixture.*`: 126 passed, 1 pre-existing skip, no TSan reports. </details> --------- Signed-off-by: Efraim Eygin <eeygin@nvidia.com>
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…-dynamo#2402) ## What? `prometheus_mp` no longer requires `NIXL_TELEMETRY_MULTIPROC_DIR`. When it is unset or empty, the directory defaults to `/dev/shm/nixl-telemetry-<euid>-<port>` (under the system temp directory when `/dev/shm` is not writable) and the chosen path is logged at INFO. Processes of one user that share `NIXL_TELEMETRY_PROMETHEUS_PORT` are then aggregated behind that port with no other configuration. If the default directory cannot be used, for example because another user took the name first, the process warns and runs without telemetry instead of failing agent construction. An explicit directory still wins and stays fatal. ## Why? [NVBug 6575930](https://nvbugspro.nvidia.com/bug/6575930): TensorRT-LLM with `--tp_size 2` under Dynamo runs two NIXL processes with `NIXL_TELEMETRY_EXPORTER=prometheus`, one port and no directory; older releases crash and v1.5.0 exports one process. [NIX-2062](https://linear.app/nvidia/issue/NIX-2062) makes `prometheus` load `prometheus_mp`, but `prometheus_mp` throws out of the `nixlAgent` constructor when the directory is unset. This is one of three NIX-2062 PRs, alongside the test-only ai-dynamo#2400; the last one adds the alias and removes the single-process exporter. ## How? <details> <summary>Behaviour, tests, docs</summary> - Only an unset or empty variable gets the default. The port comes from the same `NIXL_TELEMETRY_PROMETHEUS_PORT` lookup as the bind address, so processes configured with different ports keep separate endpoints. Unrelated jobs of one user on one port share the directory too; the README says to give concurrent jobs different ports. - An explicit directory behaves as before: it is created `0700`, a foreign owner or a group/world-writable mode warns, and one that cannot be created throws. The default directory differs in one way: when it cannot be created, or the store cannot be created in it, the exporter throws `nixlTelemetryBindFailed`, so `nixlTelemetry::create` warns once and returns null. `storeWriter` now throws a dedicated `storeSetupError` for its OS failures, which is all the exporter catches, so configuration errors such as an over-long bucket list stay fatal. It also reserves its file with `posix_fallocate` instead of `ftruncate`, so a full `/dev/shm` fails store creation with `ENOSPC` instead of raising `SIGBUS` on the first write. The `nixlTelemetryBindFailed` and `nixlTelemetry::create` API docs now name that case next to the bind one. - The default aggregates only processes of one user that see the same `/dev/shm` (or, on the temp-dir fallback, resolve the same temp directory): always within one container, and across a pod's containers unless one mounts its own `/dev/shm`. Containers that share a network namespace but not `/dev/shm` need an explicit shared directory; without one, the first to bind exports its own processes and the others warn, with no crash. Tests: - `MpExporterTest.EmptyMultiprocDirDefaultsToAPerUserPerPortDir` replaces `MpExporterStandaloneTest.MissingMultiprocDirThrows`: the store lands in the default directory for the fixture's port, created `0700`, and `TearDown` removes it. - `MpExporterTest.UncreatableMultiprocDirThrows`: an explicit directory under a regular file still throws. - `MpExporterTest.SquattedDefaultDirRunsWithoutTelemetry`: a regular file at the default name makes `nixlTelemetry::create` return null with one warning. - `MpExporterTest.OverlongBucketListStaysFatalWithTheDefaultDir` and `MpStoreTest.OsFailureThrowsStoreSetupError`: only OS failures degrade. - `MpE2ETest.RanksConfiguredWithOnlyAPortAggregateBehindIt`: two forked processes that set only `NIXL_TELEMETRY_ENABLE`, `NIXL_TELEMETRY_EXPORTER=prometheus_mp` and the port each create their telemetry through `nixlTelemetry::create`, and one scrape shows one `agent_tx_bytes_total` series per process. A follow-up switches the id to `prometheus`. - Each new case fails against its own mutation and only that one; with the exporter change reverted, the default-path and e2e cases fail. Docs: the `prometheus_mp` README (the default, sharing across jobs and containers, the stores left behind, the shared-host caveat), `docs/telemetry.md`, and fern rows for `NIXL_TELEMETRY_MULTIPROC_DIR`, `NIXL_TELEMETRY_RANK_ENV` and `NIXL_TELEMETRY_MP_STALE_TTL`. Tested on debug and TSan builds with `--gtest_filter=Mp*:prometheusTelemetryTest.*:histogramBucketsTest.*:telemetryTest.*:telemetryStressTest.*:LoadedPluginTestFixture.*`: 126 passed, 1 pre-existing skip, no TSan reports. </details> --------- Signed-off-by: Efraim Eygin <eeygin@nvidia.com>
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…ocess exporter (#2405) ## What? `NIXL_TELEMETRY_EXPORTER=prometheus` now loads the multi-process exporter (`libtelemetry_exporter_prometheus_mp.so`) through an alias in the plugin manager, and the single-process exporter is removed. `prometheus_mp` keeps working and loads the same plugin. This is the last of three NIX-2062 PRs, after #2402 (default `NIXL_TELEMETRY_MULTIPROC_DIR`) and #2400 (tests). What `prometheus` users see: - Every process of one user on a host that uses the same port is exported behind that endpoint; before, only the process that won the bind was. - Series keep `hostname` and `agent_name`. They gain `local_rank` when `LOCAL_RANK` (or the variable named by `NIXL_TELEMETRY_RANK_ENV`) is set, and `pid`/`agent_instance` only while two live agents share a name. - When a process outside the run holds the port, a rank keeps writing its metrics and warns, instead of running without telemetry. - A departed agent's series stay published up to `NIXL_TELEMETRY_MP_STALE_TTL` (30 s), unless a successor reuses its name. - `NIXL_TELEMETRY_HISTOGRAM_BUCKETS_US` accepts at most 32 bounds, and small store files are left under `/dev/shm/nixl-telemetry-<euid>-<port>`. ## Why? [NVBug 6575930](https://nvbugspro.nvidia.com/bug/6575930): TensorRT-LLM with `--tp_size 2` under Dynamo runs two NIXL processes with `NIXL_TELEMETRY_EXPORTER=prometheus` on one port; older releases crash and v1.5.0 exports one process. [NIX-2062](https://linear.app/nvidia/issue/NIX-2062): `prometheus` and `prometheus_mp` serve the same purpose, so keep one exporter. With this, the bug's config exports every process, unchanged. ## How? <details> <summary>Code, tests, docs</summary> - Plugin manager: `loadTelemetryPlugin()` maps `prometheus` to `prometheus_mp` before composing the plugin path and caches the handle under both names, so both ids share one `dlopen` handle. A stale `libtelemetry_exporter_prometheus.so` left in an upgraded install directory is never opened. A symlink was rejected because the wheel builder drops `.so` symlinks. - Build: `src/plugins/telemetry/prometheus/` is deleted, and its prometheus-cpp lookup, "not found" warning included, moves to `src/plugins/telemetry/meson.build`. The DOCA histogram parity test links `nixl_telemetry_mp_exporter_dep` instead of compiling the deleted exporter. - Tests: - Deleted with the exporter: `telemetry_prometheus_test.cpp`, `telemetry_prometheus_stress_test.cpp` and `prometheus_telemetry_fixture.h`; `telemetry_histogram_test.cpp` keeps its five `histogramBucketsTest.*` cases. Their other cases were ported to the multi-process exporter in #2400 or already had twins in `telemetry_mp_core_test.cpp`; only the deleted code's use-after-free regression test and `BindCollisionThrowsBindFailed` go without a replacement. - The scrape, stress and bug-shaped e2e tests from #2400 and #2402 now use the `prometheus` id, and `MpExporterTest.PrometheusIdLoadsTheSamePlugin` checks that both ids return one handle named `prometheus_mp`. With the alias disabled, the 11 tests that load `prometheus` fail and the other 71 `Mp*` tests pass. - `histogram_parity_test` runs the multi-process exporter in a private directory, and its comparison ignores `local_rank`. - Docs: the `prometheus_mp` README now describes the one exporter, selected as `prometheus`. It takes over the deleted README's metrics table and the allowlist and `NIXL_PLUGIN_DIR` notes, and drops the stale libcurl requirement (prometheus-cpp is built without push, and neither plugin links libcurl). `docs/telemetry.md`, the fern user guide and the env-var rows describe one exporter. - `nixlTelemetryBindFailed` is unchanged. Whether it needs a more general name, raised on #2402, is left for a separate PR. Tested on debug and TSan builds with `--gtest_filter=Mp*:histogramBucketsTest.*:telemetryTest.*:telemetryStressTest.*:*PluginTestFixture*`: 122 passed, 4 pre-existing skips, no TSan reports. `histogram_parity_test` passes on debug, and `meson install` ships `libtelemetry_exporter_prometheus_mp.so` and no `libtelemetry_exporter_prometheus.so`. </details> <!-- This is an auto-generated comment: release notes by coderabbit.ai --> ## Summary by CodeRabbit * **New Features** * Selecting `prometheus` now uses the multi-process exporter; `prometheus_mp` remains an alternative name. * Processes on the same host can share an endpoint and telemetry state. Exported metrics include host and agent labels, with additional labels in certain configurations. * Prometheus and DOCA exporters share metric and histogram definitions. * **Documentation** * Updated telemetry guides and configuration references to cover exporter selection, shared endpoints, metric labels, and counter resets after process restarts. <!-- end of auto-generated comment: release notes by coderabbit.ai --> --------- Signed-off-by: Efraim Eygin <eeygin@nvidia.com>
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What?
Test-only. Ports the single-process Prometheus exporter's scrape, histogram and stress tests that are still worth keeping to
prometheus_mp, and adds amock_bind_failedtelemetry plugin so the path wherenixlTelemetry::createruns without a sink stays covered.Why?
NIX-2062 merges
prometheusandprometheus_mpinto one exporter; a follow-up PR deletes the single-process exporter and its tests. This lands the coverage that PR would otherwise delete, against the exporter that stays.How?
Cases, differences from the originals, testing
New
MpExporterTestcases, all loadingprometheus_mp:telemetry_mp_scrape_test.cpp:ScrapeEmitsExactlyTheDescriptorSeries,AgentMetricsAppearInScrape,ByteCounterSumsWhileLastGaugeTracksFinalOp,ErrorCountersUseBoundedStatusLabel,XferTimeHistogramRecordsObservations,HistogramBucketsEnvOverride,BindCollisionCreateIsNonFatalWarn.telemetry_mp_stress_test.cpp:ConcurrentAddXferStatsOverflowConservation,ConcurrentMixedWorkloadAggregation.telemetryTest.ExporterBindFailureRunsWithoutSinkloads the newmock_bind_failedplugin, whose exporter constructor throwsnixlTelemetryBindFailed, and checks thatcreatereturnsnullptrwith one warning.Differences from the single-process originals:
AgentMetricsAppearInScrapedrops the check that a departed peer's series vanish, sinceprometheus_mpkeeps publishing a departed store untilNIXL_TELEMETRY_MP_STALE_TTL(covered byDepartedWriterIsPublishedOnceMoreThenReaped). It now also checks that a lone agent has nopidoragent_instancelabel.BindCollisionCreateIsNonFatalWarn: with a foreign listener on the port,createnow returns a telemetry in writer mode and logs exactly one "is held by a process outside this run" warning.Not ported:
ExportEventIncrementReflectedInScrape(the old exporter's use-after-free regression test),BindCollisionThrowsBindFailed(covered byWriterModeWhenPortTaken), and the five cases already twinned intelemetry_mp_core_test.cpp. The single-process tests are untouched.Tested on debug and TSan builds with
--gtest_filter=Mp*:prometheusTelemetryTest.*:histogramBucketsTest.*:telemetryTest.*:telemetryStressTest.*:LoadedPluginTestFixture.*: 131 passed, 1 pre-existing skip, no TSan reports.Summary by CodeRabbit