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doc: initial cut at support tiers for diag tools
PR-URL: #21870 Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de> Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com> Reviewed-By: Anna Henningsen <anna@addaleax.net> Reviewed-By: Matheus Marchini <matheus@sthima.com>
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| # Diagnostic Tooling Support Tiers | ||
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| Diagnostic tooling is important to the consumers of Node.js. It is used both | ||
| in development and in production in order to investigate problems. The failure | ||
| of one of these tools may be as big a problem for an end user as a bug within | ||
| the runtime itself. | ||
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| The Node.js project has assessed the tools and the APIs which support those | ||
| tools. Each of the tools and APIs has been put into one of | ||
| the following tiers. | ||
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| * Tier 1 - Must always be working(CI tests passing) for all | ||
| Current and LTS Node.js releases. A release will not be shipped if the test | ||
| suite for the tool/API is not green. To be considered for inclusion | ||
| in this tier it must have a good test suite and that test suite and a job | ||
| must exist in the Node.js CI so that it can be run as part of the release | ||
| process. Tests on master will be run nightly when possible to provide | ||
| early warning of potential issues. No commit to the current and LTS | ||
| release branches should break this tool/API if the next major release | ||
| is within 1 month. In addition: | ||
| * The maintainers of the tool must remain responsive when there | ||
| are problems; | ||
| * The tool must be actively used by the ecosystem; | ||
| * The tool must be heavily depended on; | ||
| * The tool must have a guide or other documentation in the Node.js GitHub | ||
| organization or website; | ||
| * The tool must be working on all supported platforms; | ||
| * The tool must only be using APIs exposed by Nodejs as opposed to | ||
| its dependencies; and | ||
| * The tool must be open source. | ||
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| * Tier 2 - Must be working(CI tests passing) for all | ||
| LTS releases. An LTS release will not be shipped if the test | ||
| suite for the tool/API is not green. To be considered for inclusion | ||
| in this tier it must have a good test suite and that test suite and a job | ||
| must exist in the Node.js CI so that it can be run as part of the release | ||
| process. In addition: | ||
| * The maintainers of the tool must remain responsive when | ||
| there are problems; | ||
| * The tool must be actively used by the ecosystem; | ||
| * The tool must be heavily depended on; | ||
| * The tool must have a guide or other documentation in the Node.js GitHub | ||
| organization or website; | ||
| * The tool must be open source. | ||
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| * Tier 3 - If possible its test suite | ||
| will be run at least nightly in the Node.js CI and issues opened for | ||
| 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 | ||
| 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 | ||
| collaborative decision between Diagnostics WG and Release WG. Some of the | ||
| criteria considered might be: | ||
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| * If the tool fits into a key category as listed below. | ||
| * Whether the tool is actively used by the ecosystem. | ||
| * The availability of alternatives. | ||
| * Impact to the overall ecosystem if the tool is not working. | ||
| * The availability of reliable test suite that can be integrated into our CI. | ||
| * The availability of maintainer or community collaborator who will help | ||
| resolve issues when there are CI failures. | ||
| * 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 | ||
| information. | ||
| * Tracing (T) - use of logging to provide information about execution flow. | ||
| * Memory (M) - tools that provide additional information about memory | ||
| used in the Heap or by native code. | ||
| * Profiling (P) - tools that provide additional information about where | ||
| CPU cycles are being spent. | ||
| * AsyncFlow (A) - tools that provide additional insight into asynchronous | ||
| 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 | ||
| be added to the list. If there is a new tool that should be added to the | ||
| list, it should start by being added to the "Not yet classified" or | ||
| "Tier 4" lists. Once it has been added to the list "promotion" to Tier 3 | ||
| through Tier 1 requires that the requirements listed above be met AND | ||
| have agreement from Diagnostics WG and Release WG based on the criteria | ||
| 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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| ## 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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| ## 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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| ## 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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| ## Not yet classified | ||
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| | Tool Type | Tool/API Name | Regular Testing in Node.js CI | Integrated with Node.js | Target Tier | | ||
| |-----------|---------------------------|-------------------------------|-------------------------|-------------| | ||
| | FFDC | node-report | No | No | 1 | | ||
| | Memory | mdb_V8 | No | No | 4 | | ||
| | Memory | node-heapdump | No | No | 2 | | ||
| | Memory | V8 heap profiler | No | Yes | 1 | | ||
| | Memory | V8 sampling heap profiler | No | Yes | 1 | | ||
| | AsyncFlow | Async Hooks (API) | ? | Yes | 1 | | ||
| | Debugger | V8 Debug protocol (API) | No | Yes | 1 | | ||
| | Debugger | Command line Debug Client | ? | Yes | 1 | | ||
| | Debugger | llnode | ? | No | 2 | | ||
| | Debugger | Chrome Dev tools | ? | No | 3 | | ||
| | Debugger | Chakracore - time-travel | No | Data source only | too early | | ||
| | Tracing | trace_events (API) | No | Yes | 1 | | ||
| | Tracing | DTrace | No | Partial | 3 | | ||
| | Tracing | LTTng | No | Removed? | N/A | | ||
| | Tracing | ETW | No | Partial | 3 | | ||
| | Tracing | Systemtap | No | Partial | ? | | ||
| | Profiling | V8 CPU profiler (--prof) | No | Yes | 1 | | ||
| | Profiling | Linux perf | No | Partial | ? | | ||
| | Profiling | DTrace | No | Partial | 3 | | ||
| | Profiling | Windows Xperf | No | ? | ? | | ||
| | Profiling | 0x | No | No | 4 | | ||
| | Profiling | node-clinic | No | No | to early | | ||
| | F/P/T | appmetrics | No | No | ? | | ||
| | M/T | eBPF tracing tool | No | No | ? | |