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[PR #10098] Set keyword flags on all tracelog events #27891

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opened 2026-01-31 09:24:55 +00:00 by claunia · 0 comments
claunia commented 2026-01-31 09:24:55 +00:00
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Original Pull Request: https://github.com/microsoft/terminal/pull/10098

State: closed
Merged: Yes

Set keyword flags on all events so those sharing a provider with
telemetry do not fire unless tracing is enabled

PR Checklist

Detailed Description of the Pull Request / Additional comments

I initially thought that we would need to split providers here to
accomplish this... but @DHowett helped me realize that might be a lot of
additional metadata and bloat binary size. So with help from a friend
from fundamentals, I realized that we could use Keywords to
differentiate here. We can no longer define 0 keywords as that
represents an any/all scenario. Every TraceLoggingWrite event now
needs a keyword. When our events have a keyword, they're not included in
any trace. Additionally, when we have an explicit keyword to check that
is different from the ones used for the telemetry pipeline, we can
ensure that we only do "hard work" to generate debug trace data when an
"ALL" type listener like TraceView or Windows Performance Recorder with
our profiles is listening to these providers for ALL keyworded events.

Validation Steps Performed

  • - Built with full release build config to confirm performance is
    worse than dev builds BECAUSE of the telemetry event collector camping
    our provider and triggering full trace event generation on shared
    providers.
  • - Built with full release build config to enable statistics
    collection and validated trace event collection is excluded and trace
    event short-circuits work with this change.
  • - Checked that TraceView still sees both telemetry and tracing
    events
  • - Checked that WPR with our .wprp profile sees both telemetry and
    tracing events
**Original Pull Request:** https://github.com/microsoft/terminal/pull/10098 **State:** closed **Merged:** Yes --- Set keyword flags on all events so those sharing a provider with telemetry do not fire unless tracing is enabled ## PR Checklist * [x] Closes #10093 * [x] I work here * [x] Tests passed * [x] Documentation added in `til.h` about how keywords work and at the only other site of keywords we define in the Host project tracing files. ## Detailed Description of the Pull Request / Additional comments I initially thought that we would need to split providers here to accomplish this... but @DHowett helped me realize that might be a lot of additional metadata and bloat binary size. So with help from a friend from fundamentals, I realized that we could use Keywords to differentiate here. We can no longer define 0 keywords as that represents an any/all scenario. Every `TraceLoggingWrite` event now needs a keyword. When our events have a keyword, they're not included in any trace. Additionally, when we have an explicit keyword to check that is different from the ones used for the telemetry pipeline, we can ensure that we only do "hard work" to generate debug trace data when an "ALL" type listener like TraceView or Windows Performance Recorder with our profiles is listening to these providers for ALL keyworded events. ## Validation Steps Performed - [x] - Built with full release build config to confirm performance is worse than dev builds BECAUSE of the telemetry event collector camping our provider and triggering full trace event generation on shared providers. - [x] - Built with full release build config to enable statistics collection and validated trace event collection is excluded and trace event short-circuits work with this change. - [x] - Checked that TraceView still sees both telemetry and tracing events - [x] - Checked that WPR with our .wprp profile sees both telemetry and tracing events
claunia added the pull-request label 2026-01-31 09:24:55 +00:00
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Reference: starred/terminal#27891
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