fs: add built-in fs.operation diagnostics channels - #65370
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Add a built-in node:diagnostics_channel channel family for file system operations performed through node:fs and node:fs/promises. The channels are named tracing:fs.operation:start, :end, :asyncStart, :asyncEnd, and :error, and share an event payload carrying the operation name, the API (sync/callback/promise), path/dest/fd fields when applicable, plus result/error following TracingChannel conventions. Events are published from the internal shared file system layer rather than the JS wrappers, so captured function references still emit events. Signed-off-by: Matteo Collina <hello@matteocollina.com>
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Adds a built-in
node:diagnostics_channelchannel family for file system operations performed throughnode:fsandnode:fs/promises, addressing #65330.The channels are
tracing:fs.operation:start,:end,:asyncStart,:asyncEnd, and:error, and share an event payload carrying the operation name, the API (sync/callback/promise),path/dest/fdfields when applicable, plusresult/errorfollowing TracingChannel conventions. Subscribers can usediagnostics_channel.tracingChannel('fs.operation')to subscribe to all events at once.Events are published from the internal shared file system layer rather than the JS wrappers, so captured function references still emit events. Adds documentation and a new
test/parallel/test-diagnostics-channel-fs.js.