[9pace]

Fixes #

TelemetrySession.emit() increments this.count, then for DEPLOY events awaits trackDeployStatistics() (a read and write of the telemetry state file), and only then builds eventId from this.count. With --concurrency, other events are emitted during that await, so several DEPLOY events read the same final count and are sent with the same eventId.

We saw this in the telemetry data as repeated event IDs on CLI versions after the subprocess sender, mostly DEPLOY events in the same request with different contents.

This takes the event id and timestamp at the start of emit(), before the await. The timestamp had the same problem, it recorded when the state file write finished.

withTelemetryState is also an unlocked read and write, so concurrent DEPLOY events can lose updates to sequentialDeploymentFailures. Not changed here.

Added a unit test that emits two DEPLOY events at once and checks they get :1 and :2. On main both get :2. Ran the session.test.ts suite and eslint for aws-cdk.

Checklist

• This change contains a major version upgrade for a dependency and I confirm all breaking changes are addressed
  • Release notes for the new version:

---

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.06%. Comparing base (611e948) to head (0d9e90b).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2128   +/-   ##
=======================================
  Coverage   92.05%   92.06%           
=======================================
  Files          82       82           
  Lines       13195    13199    +4     
  Branches     1894     1897    +3     
=======================================
+ Hits        12146    12151    +5     
+ Misses       1011     1010    -1     
  Partials       38       38           

Flag	Coverage Δ
suite.unit	92.06% <100.00%> (+<0.01%)	⬆️

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