Add telemetry metrics for dropped/skipped events

[jpbempel]

What Does This Do

when snapshots are dropped (Queue full) or skipped (rate limit or eval timeout) we are sending telemetry metrics with te number of events (snapshots) involved. metrics are tagged by reason

we are removing the old DebuggerMetrics and the skip cause to replace by this new telemetry metrics.
More telemetry metrics will be added later

Motivation

Additional Notes

Contributor Checklist

• Format the title according to the contribution guidelines
• Assign the type: and (comp: or inst:) labels in addition to any other useful labels
• Avoid using close, fix, or any linking keywords when referencing an issue
  Use solves instead, and assign the PR milestone to the issue
• Update the CODEOWNERS file on source file addition, migration, or deletion
• Update public documentation with any new configuration flags or behaviors
• Once approved, use merge queue to merge the PR

Jira ticket: DEBUG-5839

[dd-octo-sts]

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[datadog-prod-us1-4]

The metric collector can lose event counts during a concurrent reset. Some timeout and disabled-session paths also omit or use an incorrect skip reason.

_{Open Bits AI session}

_{🤖 Datadog Autotest · Commit 560d92d · What is Autotest? · @DataDog review to ask questions · Any feedback? Reach out in #autotest}

[pr-commenter]

Debugger benchmarks

Parameters

	Baseline	Candidate
baseline_or_candidate	baseline	candidate
ci_job_date	1787908608	1787908934
end_time	2026-08-28T09:18:15	2026-08-28T09:23:42
git_branch	master	jpbempel/add-debugger-telemetry
git_commit_sha	86c5198	89cdeff
start_time	2026-08-28T09:16:49	2026-08-28T09:22:15

See matching parameters

	Baseline	Candidate
ci_job_id	1993279825	1993279825
ci_pipeline_id	133865532	133865532
cpu_model	Intel(R) Xeon(R) Platinum 8259CL CPU @ 2.50GHz	Intel(R) Xeon(R) Platinum 8259CL CPU @ 2.50GHz
git_commit_date	1787907974	1787907974

Summary

Found 0 performance improvements and 0 performance regressions! Performance is the same for 10 metrics, 5 unstable metrics.

See unchanged results

scenario	Δ mean agg_http_req_duration_min	Δ mean agg_http_req_duration_p50	Δ mean agg_http_req_duration_p75	Δ mean agg_http_req_duration_p99	Δ mean throughput
scenario:noprobe	unstable [-18.075µs; +13.279µs] or [-5.836%; +4.287%]	unstable [-23.173µs; +29.501µs] or [-6.787%; +8.641%]	unstable [-31.083µs; +40.996µs] or [-8.742%; +11.530%]	unstable [-104.554µs; +107.060µs] or [-8.260%; +8.457%]	same
scenario:basic	same	same	same	unstable [-89.846µs; +133.694µs] or [-7.897%; +11.751%]	same
scenario:loop	same	same	same	same	same

Request duration reports for reports

gantt
    title reports - request duration [CI 0.99] : candidate=None, baseline=None
    dateFormat X
    axisFormat %s
section baseline
noprobe (341.413 µs) : 314, 368
.   : milestone, 341,
basic (322.415 µs) : 315, 330
.   : milestone, 322,
loop (8.096 ms) : 8034, 8158
.   : milestone, 8096,
section candidate
noprobe (344.577 µs) : 322, 368
.   : milestone, 345,
basic (322.759 µs) : 317, 329
.   : milestone, 323,
loop (8.091 ms) : 8028, 8154
.   : milestone, 8091,

Loading

• baseline results

Scenario	Request median duration [CI 0.99]
noprobe	341.413 µs [314.462 µs, 368.365 µs]
basic	322.415 µs [315.062 µs, 329.769 µs]
loop	8.096 ms [8.034 ms, 8.158 ms]

• candidate results

Scenario	Request median duration [CI 0.99]
noprobe	344.577 µs [321.637 µs, 367.518 µs]
basic	322.759 µs [316.814 µs, 328.704 µs]
loop	8.091 ms [8.028 ms, 8.154 ms]

[dd-octo-sts]

🟢 Java Benchmark SLOs — All performance SLOs passed

Suite	Status
Startup	🟢 pass

SLO thresholds are defined here based on automatically generated metrics. A warning is raised when results are within 5% of the threshold.

PR vs. master results

Scenario	Candidate	master	Δ (95% CI of mean)
startup:insecure-bank:iast:Agent	14.05 s	14.00 s	[-0.5%; +1.3%] (no difference)
startup:insecure-bank:tracing:Agent	12.91 s	13.03 s	[-1.5%; -0.3%] (maybe better)
startup:petclinic:appsec:Agent	17.57 s	17.45 s	[-0.0%; +1.4%] (no difference)
startup:petclinic:iast:Agent	17.49 s	17.53 s	[-1.1%; +0.6%] (no difference)
startup:petclinic:profiling:Agent	17.45 s	17.48 s	[-1.5%; +1.1%] (no difference)
startup:petclinic:sca:Agent	17.49 s	17.29 s	[+0.1%; +2.2%] (maybe worse)
startup:petclinic:tracing:Agent	16.59 s	16.64 s	[-1.5%; +1.0%] (no difference)

Commit: 96158d3d · CI Pipeline · Benchmarking Platform UI

---

Load and DaCapo benchmarks can be triggered manually in the GitLab pipeline. Results will appear in the Benchmarking Platform UI after completion.

[sarahchen6]

Looks like Jacoco is complaining about test coverage, but otherwise LGTM