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PR-URL: https://github.com/nodejs/node/pull/37506 Reviewed-By: Rich Trott <rtrott@gmail.com> Reviewed-By: Pooja D P <Pooja.D.P@ibm.com> Reviewed-By: Harshitha K P <harshitha014@gmail.com> Reviewed-By: Darshan Sen <raisinten@gmail.com>
149 lines
8.7 KiB
Markdown
149 lines
8.7 KiB
Markdown
# Diagnostic tooling support tiers
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Diagnostic tooling is important to the consumers of Node.js. It is used both
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in development and in production in order to investigate problems. The failure
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of one of these tools may be as big a problem for an end user as a bug within
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the runtime itself.
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The Node.js project has assessed the tools and the APIs which support those
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tools. Each of the tools and APIs has been put into one of
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the following tiers.
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* Tier 1 - Must always be working(CI tests passing) for all
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Current and LTS Node.js releases. A release will not be shipped if the test
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suite for the tool/API is not green. To be considered for inclusion
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in this tier it must have a good test suite and that test suite and a job
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must exist in the Node.js CI so that it can be run as part of the release
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process. Tests on master will be run nightly when possible to provide
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early warning of potential issues. No commit to the current and LTS
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release branches should break this tool/API if the next major release
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is within 1 month. In addition:
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* The maintainers of the tool must remain responsive when there
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are problems;
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* The tool must be actively used by the ecosystem;
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* The tool must be heavily depended on;
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* The tool must have a guide or other documentation in the Node.js GitHub
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organization or website;
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* The tool must be working on all supported platforms;
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* The tool must only be using APIs exposed by Node.js as opposed to
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its dependencies; and
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* The tool must be open source.
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* Tier 2 - Must be working(CI tests passing) for all
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LTS releases. An LTS release will not be shipped if the test
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suite for the tool/API is not green. To be considered for inclusion
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in this tier it must have a good test suite and that test suite and a job
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must exist in the Node.js CI so that it can be run as part of the release
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process. In addition:
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* The maintainers of the tool must remain responsive when
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there are problems;
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* The tool must be actively used by the ecosystem;
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* The tool must be heavily depended on;
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* The tool must have a guide or other documentation in the Node.js GitHub
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organization or website;
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* The tool must be open source.
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* Tier 3 - If possible its test suite
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will be run at least nightly in the Node.js CI and issues opened for
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failures. Does not block shipping a release.
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* Tier 4 - Does not block shipping a release.
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* Unclassified - tool/API is new or does not have the required testing in the
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Node.js CI in order to qualify for a higher tier.
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The choice of which tier a particular tool will be assigned to, will be a
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collaborative decision between Diagnostics WG and Release WG. Some of the
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criteria considered might be:
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* If the tool fits into a key category as listed below.
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* Whether the tool is actively used by the ecosystem.
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* The availability of alternatives.
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* Impact to the overall ecosystem if the tool is not working.
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* The availability of reliable test suite that can be integrated into our CI.
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* The availability of maintainer or community collaborator who will help
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resolve issues when there are CI failures.
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* If the tool is maintained by the Node.js Foundation GitHub organization.
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The current categories of tools/APIs that fall under these Tiers are:
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* FFDC (F) - First failure data capture, easy to consume initial diagnostic
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information.
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* Tracing (T) - use of logging to provide information about execution flow.
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* Memory (M) - tools that provide additional information about memory
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used in the Heap or by native code.
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* Profiling (P) - tools that provide additional information about where
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CPU cycles are being spent.
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* AsyncFlow (A) - tools that provide additional insight into asynchronous
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execution flow.
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## Adding a tool to this list
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Any tool that might be used to investigate issues when running Node.js can
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be added to the list. If there is a new tool that should be added to the
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list, it should start by being added to the "Not yet classified" or
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"Tier 4" lists. Once it has been added to the list "promotion" to Tier 3
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through Tier 1 requires that the requirements listed above be met AND
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have agreement from Diagnostics WG and Release WG based on the criteria
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listed above.
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## Tiers
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The tools are currently assigned to Tiers as follows:
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## Tier 1
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| Tool Type | Tool/API Name | Regular Testing in Node.js CI | Integrated with Node.js | Target Tier |
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|-----------|---------------------------|-------------------------------|-------------------------|-------------|
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| FFDC | diagnostic report | Yes | Yes | 1 |
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## Tier 2
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| Tool Type | Tool/API Name | Regular Testing in Node.js CI | Integrated with Node.js | Target Tier |
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|-----------|---------------|-------------------------------|-------------------------|-------------|
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## Tier 3
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| Tool Type | Tool/API Name | Regular Testing in Node.js CI | Integrated with Node.js | Target Tier |
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|-----------|--------------------------------------|-------------------------------|-------------------------|-------------|
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| Profiling | V8 CPU profiler | Partial (V8 Tests) | Yes | 1 |
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| Profiling | --prof/--prof-process flags | Yes | Yes | 1 |
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| Profiling | V8 CodeEventHandler API | Partial (V8 Tests) | Yes | 2 |
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| Profiling | V8 --interpreted-frames-native-stack | Yes | Yes | 2 |
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| Profiling | Linux perf | Yes | Partial | 2 |
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## Tier 4
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| Tool Type | Tool/API Name | Regular Testing in Node.js CI | Integrated with Node.js | Target Tier |
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|-----------|---------------|-------------------------------|-------------------------|-------------|
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## Not yet classified
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| Tool Type | Tool/API Name | Regular Testing in Node.js CI | Integrated with Node.js | Target Tier |
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|-----------|---------------------------|-------------------------------|-------------------------|-------------|
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| FFDC | node-report | No | No | 1 |
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| Memory | mdb_V8 | No | No | 4 |
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| Memory | node-heapdump | No | No | 2 |
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| Memory | V8 heap profiler | No | Yes | 1 |
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| Memory | V8 sampling heap profiler | No | Yes | 1 |
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| AsyncFlow | Async Hooks (API) | ? | Yes | 1 |
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| Debugger | V8 Debug protocol (API) | No | Yes | 1 |
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| Debugger | Command line Debug Client | ? | Yes | 1 |
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| Debugger | llnode | ? | No | 2 |
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| Debugger | Chrome Dev tools | ? | No | 3 |
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| Debugger | Chakracore - time-travel | No | Data source only | too early |
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| Tracing | trace_events (API) | No | Yes | 1 |
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| Tracing | DTrace | No | Partial | 3 |
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| Tracing | LTTng | No | Removed? | N/A |
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| Tracing | ETW | No | Partial | 3 |
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| Tracing | Systemtap | No | Partial | ? |
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| Profiling | DTrace | No | Partial | 3 |
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| Profiling | Windows Xperf | No | ? | ? |
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| Profiling | 0x | No | No | 4 |
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| Profiling | node-clinic | No | No | too early |
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| F/P/T | appmetrics | No | No | ? |
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| M/T | eBPF tracing tool | No | No | ? |
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