autodiscovery: declarative discovery probes (KrakenD experiment) by vitkyrka · Pull Request #50199 · DataDog/datadog-agent

vitkyrka · 2026-04-30T16:14:35Z

Summary

New file format auto_conf_discovery.yaml parsed by the file config provider (comp/core/autodiscovery/providers/config_reader.go).
New comp/core/autodiscovery/discovery package: OpenMetrics prober (HTTP GET + Prometheus-line verification + 30s negative cache + bounded budget).
New %%discovered_port%% template variable (pkg/util/tmplvar), populated via a Service wrapper after a successful probe — no configresolver.Resolve signature change.
AutoDiscovery's reconcile path now runs the prober before resolving any template that has a discovery: block; on no-match the check is not scheduled (logged at DEBUG).

Targets the generic-openmetrics-scan bucket from the integrations-core analysis (51/260 integrations, ~20%). Tracks Confluence ticket DSCVR/6650004331.

Companion PR with the krakend integration's auto_conf_discovery.yaml and the experiment design/plan: DataDog/integrations-core#23547

Test plan

dda inv test --targets=./comp/core/autodiscovery/integration,./comp/core/autodiscovery/providers,./comp/core/autodiscovery/discovery,./comp/core/autodiscovery/autodiscoveryimpl,./pkg/util/tmplvar — 442 tests pass.
dda inv linter.go — clean on touched packages.
End-to-end with krakend dev env, default port 9090: probe matched, krakend check scheduled with the discovered URL, metrics flowing.
End-to-end with krakend metrics on non-default port 9000: hint dropped, fallback scan found the port, check ran.
Negative behaviour (no candidate matches): demonstrated by initial probe attempt against a still-warming krakend container — did not match, then recovered after the 30s negative cache expired. Also unit-tested by TestProbe_AllFailReturnsFalse.

Known limitation (flagged for follow-up before any production rollout)

The probe runs while the configManager mutex is held — serialises service reconciliation for up to 2s per match. Acceptable for an experiment, but should move outside the lock (or async) before broadening.

🤖 Generated with Claude Code

dd-octo-sts · 2026-04-30T16:23:44Z

Go Package Import Differences

Baseline: f70d80c
Comparison: 6f34723

binary	os	arch	change
agent	linux	amd64	+1, -0 +github.com/DataDog/datadog-agent/comp/core/autodiscovery/discovery
agent	linux	arm64	+1, -0 +github.com/DataDog/datadog-agent/comp/core/autodiscovery/discovery
agent	windows	amd64	+1, -0 +github.com/DataDog/datadog-agent/comp/core/autodiscovery/discovery
agent	darwin	amd64	+1, -0 +github.com/DataDog/datadog-agent/comp/core/autodiscovery/discovery
agent	darwin	arm64	+1, -0 +github.com/DataDog/datadog-agent/comp/core/autodiscovery/discovery
agent	aix	ppc64	+1, -0 +github.com/DataDog/datadog-agent/comp/core/autodiscovery/discovery
iot-agent	linux	amd64	+1, -0 +github.com/DataDog/datadog-agent/comp/core/autodiscovery/discovery
iot-agent	linux	arm64	+1, -0 +github.com/DataDog/datadog-agent/comp/core/autodiscovery/discovery
heroku-agent	linux	amd64	+1, -0 +github.com/DataDog/datadog-agent/comp/core/autodiscovery/discovery
cluster-agent	linux	amd64	+1, -0 +github.com/DataDog/datadog-agent/comp/core/autodiscovery/discovery
cluster-agent	linux	arm64	+1, -0 +github.com/DataDog/datadog-agent/comp/core/autodiscovery/discovery
cluster-agent-cloudfoundry	linux	amd64	+1, -0 +github.com/DataDog/datadog-agent/comp/core/autodiscovery/discovery
cluster-agent-cloudfoundry	linux	arm64	+1, -0 +github.com/DataDog/datadog-agent/comp/core/autodiscovery/discovery

dd-octo-sts · 2026-04-30T16:43:42Z

Files inventory check summary

File checks results against ancestor f70d80cf:

Results for datadog-agent_7.80.0~devel.git.400.6f34723.pipeline.110744978-1_amd64.deb:

No change detected

dd-octo-sts · 2026-04-30T16:51:57Z

Static quality checks

✅ Please find below the results from static quality gates
Comparison made with ancestor f70d80c
📊 Static Quality Gates Dashboard
🔗 SQG Job

Successful checks

Info

	Quality gate	Change	Size (prev → curr → max)
✅	agent_deb_amd64	+36.12 KiB (0.00% increase)	740.757 → 740.792 → 750.310
✅	agent_deb_amd64_fips	+40.16 KiB (0.01% increase)	699.160 → 699.199 → 702.690
✅	agent_heroku_amd64	+32.09 KiB (0.01% increase)	309.178 → 309.209 → 313.960
✅	agent_rpm_amd64	+36.12 KiB (0.00% increase)	740.741 → 740.776 → 750.280
✅	agent_rpm_amd64_fips	+40.16 KiB (0.01% increase)	699.143 → 699.183 → 702.670
✅	agent_rpm_arm64	+36.12 KiB (0.00% increase)	718.705 → 718.741 → 724.050
✅	agent_rpm_arm64_fips	+36.12 KiB (0.01% increase)	680.207 → 680.242 → 684.460
✅	agent_suse_amd64	+36.12 KiB (0.00% increase)	740.741 → 740.776 → 750.280
✅	agent_suse_amd64_fips	+40.16 KiB (0.01% increase)	699.143 → 699.183 → 702.670
✅	agent_suse_arm64	+36.12 KiB (0.00% increase)	718.705 → 718.741 → 724.050
✅	agent_suse_arm64_fips	+36.12 KiB (0.01% increase)	680.207 → 680.242 → 684.460
✅	docker_agent_amd64	+36.12 KiB (0.00% increase)	801.141 → 801.176 → 805.870
✅	docker_agent_arm64	+36.12 KiB (0.00% increase)	803.926 → 803.962 → 809.730
✅	docker_agent_jmx_amd64	+36.13 KiB (0.00% increase)	992.060 → 992.096 → 996.590
✅	docker_agent_jmx_arm64	+36.12 KiB (0.00% increase)	983.625 → 983.660 → 989.410
✅	docker_cluster_agent_amd64	+40.12 KiB (0.02% increase)	206.539 → 206.578 → 207.600
✅	docker_cluster_agent_arm64	+64.12 KiB (0.03% increase)	220.571 → 220.633 → 221.150
✅	docker_dogstatsd_arm64	+64.0 KiB (0.17% increase)	37.565 → 37.627 → 38.080
✅	dogstatsd_deb_amd64	+4.0 KiB (0.01% increase)	30.012 → 30.016 → 30.770
✅	dogstatsd_rpm_amd64	+4.0 KiB (0.01% increase)	30.012 → 30.016 → 30.770
✅	dogstatsd_suse_amd64	+4.0 KiB (0.01% increase)	30.012 → 30.016 → 30.770
✅	iot_agent_deb_amd64	+32.16 KiB (0.07% increase)	44.443 → 44.474 → 44.970
✅	iot_agent_deb_arm64	+32.09 KiB (0.08% increase)	41.423 → 41.454 → 42.560
✅	iot_agent_deb_armhf	+28.06 KiB (0.06% increase)	42.163 → 42.191 → 42.740
✅	iot_agent_rpm_amd64	+32.16 KiB (0.07% increase)	44.443 → 44.474 → 44.970
✅	iot_agent_suse_amd64	+32.16 KiB (0.07% increase)	44.443 → 44.474 → 44.970

4 successful checks with minimal change (< 2 KiB)

	Quality gate	Current Size
✅	docker_cws_instrumentation_amd64	7.142 MiB
✅	docker_cws_instrumentation_arm64	6.689 MiB
✅	docker_dogstatsd_amd64	39.358 MiB
✅	dogstatsd_deb_arm64	28.157 MiB

On-wire sizes (compressed)

	Quality gate	Change	Size (prev → curr → max)
✅	agent_deb_amd64	+7.83 KiB (0.00% increase)	175.139 → 175.147 → 179.160
✅	agent_deb_amd64_fips	+28.43 KiB (0.02% increase)	166.956 → 166.983 → 174.440
✅	agent_heroku_amd64	+6.49 KiB (0.01% increase)	74.922 → 74.928 → 80.310
✅	agent_rpm_amd64	+21.54 KiB (0.01% increase)	177.188 → 177.209 → 182.080
✅	agent_rpm_amd64_fips	+26.13 KiB (0.02% increase)	168.348 → 168.373 → 174.140
✅	agent_rpm_arm64	-5.54 KiB (0.00% reduction)	159.321 → 159.315 → 163.610
✅	agent_rpm_arm64_fips	-8.88 KiB (0.01% reduction)	151.682 → 151.673 → 156.850
✅	agent_suse_amd64	+21.54 KiB (0.01% increase)	177.188 → 177.209 → 182.080
✅	agent_suse_amd64_fips	+26.13 KiB (0.02% increase)	168.348 → 168.373 → 174.140
✅	agent_suse_arm64	-5.54 KiB (0.00% reduction)	159.321 → 159.315 → 163.610
✅	agent_suse_arm64_fips	-8.88 KiB (0.01% reduction)	151.682 → 151.673 → 156.850
✅	docker_agent_amd64	+46.03 KiB (0.02% increase)	267.519 → 267.564 → 272.990
✅	docker_agent_arm64	+19.99 KiB (0.01% increase)	254.537 → 254.556 → 261.470
✅	docker_agent_jmx_amd64	+20.45 KiB (0.01% increase)	336.184 → 336.204 → 341.610
✅	docker_agent_jmx_arm64	+19.7 KiB (0.01% increase)	319.180 → 319.199 → 326.050
✅	docker_cluster_agent_amd64	+8.12 KiB (0.01% increase)	72.397 → 72.405 → 73.460
✅	docker_cluster_agent_arm64	+17.58 KiB (0.03% increase)	67.853 → 67.870 → 68.680
✅	docker_cws_instrumentation_amd64	neutral	2.999 MiB → 3.330
✅	docker_cws_instrumentation_arm64	neutral	2.729 MiB → 3.090
✅	docker_dogstatsd_amd64	neutral	15.234 MiB → 15.870
✅	docker_dogstatsd_arm64	neutral	14.551 MiB → 14.890
✅	dogstatsd_deb_amd64	neutral	7.939 MiB → 8.830
✅	dogstatsd_deb_arm64	neutral	6.823 MiB → 7.750
✅	dogstatsd_rpm_amd64	neutral	7.951 MiB → 8.840
✅	dogstatsd_suse_amd64	neutral	7.951 MiB → 8.840
✅	iot_agent_deb_amd64	+4.18 KiB (0.03% increase)	11.697 → 11.701 → 13.210
✅	iot_agent_deb_arm64	+12.04 KiB (0.12% increase)	9.992 → 10.004 → 11.620
✅	iot_agent_deb_armhf	+2.73 KiB (0.03% increase)	10.203 → 10.206 → 11.780
✅	iot_agent_rpm_amd64	neutral	11.717 MiB → 13.230
✅	iot_agent_suse_amd64	neutral	11.717 MiB → 13.230

cit-pr-commenter-54b7da · 2026-04-30T17:03:58Z

Regression Detector

Regression Detector Results

Metrics dashboard
Target profiles
Run ID: def880a7-35b8-4d4d-9b97-98dd9920b233

Baseline: f70d80c
Comparison: 6f34723
Diff

Optimization Goals: ✅ No significant changes detected

Experiments ignored for regressions

Regressions in experiments with settings containing erratic: true are ignored.

perf	experiment	goal	Δ mean %	Δ mean % CI	trials	links
➖	docker_containers_cpu	% cpu utilization	+2.93	[-0.09, +5.95]	1	Logs

Fine details of change detection per experiment

perf	experiment	goal	Δ mean %	Δ mean % CI	trials	links
➖	docker_containers_cpu	% cpu utilization	+2.93	[-0.09, +5.95]	1	Logs
➖	quality_gate_logs	% cpu utilization	+1.56	[+0.58, +2.54]	1	Logs bounds checks dashboard
➖	ddot_logs	memory utilization	+0.77	[+0.70, +0.84]	1	Logs
➖	otlp_ingest_metrics	memory utilization	+0.68	[+0.51, +0.84]	1	Logs
➖	tcp_syslog_to_blackhole	ingress throughput	+0.60	[+0.40, +0.80]	1	Logs
➖	otlp_ingest_logs	memory utilization	+0.35	[+0.24, +0.46]	1	Logs
➖	ddot_metrics_sum_cumulative	memory utilization	+0.21	[+0.05, +0.37]	1	Logs
➖	quality_gate_idle_all_features	memory utilization	+0.12	[+0.08, +0.16]	1	Logs bounds checks dashboard
➖	file_tree	memory utilization	+0.07	[+0.02, +0.12]	1	Logs
➖	file_to_blackhole_0ms_latency	egress throughput	+0.06	[-0.48, +0.59]	1	Logs
➖	file_to_blackhole_1000ms_latency	egress throughput	+0.03	[-0.38, +0.45]	1	Logs
➖	file_to_blackhole_100ms_latency	egress throughput	+0.02	[-0.11, +0.15]	1	Logs
➖	uds_dogstatsd_to_api	ingress throughput	+0.02	[-0.18, +0.22]	1	Logs
➖	tcp_dd_logs_filter_exclude	ingress throughput	+0.00	[-0.10, +0.11]	1	Logs
➖	file_to_blackhole_500ms_latency	egress throughput	+0.00	[-0.41, +0.42]	1	Logs
➖	ddot_metrics_sum_cumulativetodelta_exporter	memory utilization	+0.00	[-0.24, +0.24]	1	Logs
➖	uds_dogstatsd_to_api_v3	ingress throughput	+0.00	[-0.19, +0.19]	1	Logs
➖	ddot_metrics_sum_delta	memory utilization	-0.15	[-0.34, +0.04]	1	Logs
➖	uds_dogstatsd_20mb_12k_contexts_20_senders	memory utilization	-0.20	[-0.25, -0.15]	1	Logs
➖	ddot_metrics	memory utilization	-0.30	[-0.50, -0.10]	1	Logs
➖	quality_gate_idle	memory utilization	-0.47	[-0.53, -0.42]	1	Logs bounds checks dashboard
➖	docker_containers_memory	memory utilization	-0.51	[-0.61, -0.41]	1	Logs
➖	quality_gate_metrics_logs	memory utilization	-1.38	[-1.62, -1.14]	1	Logs bounds checks dashboard

Bounds Checks: ✅ Passed

perf	experiment	bounds_check_name	replicates_passed	observed_value	links
✅	docker_containers_cpu	simple_check_run	10/10	698 ≥ 26
✅	docker_containers_memory	memory_usage	10/10	245.42MiB ≤ 370MiB
✅	docker_containers_memory	simple_check_run	10/10	695 ≥ 26
✅	file_to_blackhole_0ms_latency	memory_usage	10/10	0.16GiB ≤ 1.20GiB
✅	file_to_blackhole_0ms_latency	missed_bytes	10/10	0B = 0B
✅	file_to_blackhole_1000ms_latency	memory_usage	10/10	0.20GiB ≤ 1.20GiB
✅	file_to_blackhole_1000ms_latency	missed_bytes	10/10	0B = 0B
✅	file_to_blackhole_100ms_latency	memory_usage	10/10	0.17GiB ≤ 1.20GiB
✅	file_to_blackhole_100ms_latency	missed_bytes	10/10	0B = 0B
✅	file_to_blackhole_500ms_latency	memory_usage	10/10	0.19GiB ≤ 1.20GiB
✅	file_to_blackhole_500ms_latency	missed_bytes	10/10	0B = 0B
✅	quality_gate_idle	intake_connections	10/10	3 ≤ 4	bounds checks dashboard
✅	quality_gate_idle	memory_usage	10/10	140.67MiB ≤ 147MiB	bounds checks dashboard
✅	quality_gate_idle_all_features	intake_connections	10/10	3 ≤ 4	bounds checks dashboard
✅	quality_gate_idle_all_features	memory_usage	10/10	468.83MiB ≤ 495MiB	bounds checks dashboard
✅	quality_gate_logs	intake_connections	10/10	3 ≤ 6	bounds checks dashboard
✅	quality_gate_logs	memory_usage	10/10	175.82MiB ≤ 195MiB	bounds checks dashboard
✅	quality_gate_logs	missed_bytes	10/10	0B = 0B	bounds checks dashboard
✅	quality_gate_metrics_logs	cpu_usage	10/10	350.61 ≤ 2000	bounds checks dashboard
✅	quality_gate_metrics_logs	intake_connections	10/10	3 ≤ 6	bounds checks dashboard
✅	quality_gate_metrics_logs	memory_usage	10/10	379.85MiB ≤ 430MiB	bounds checks dashboard
✅	quality_gate_metrics_logs	missed_bytes	10/10	0B = 0B	bounds checks dashboard

Explanation

Confidence level: 90.00%
Effect size tolerance: |Δ mean %| ≥ 5.00%

Performance changes are noted in the perf column of each table:

✅ = significantly better comparison variant performance
❌ = significantly worse comparison variant performance
➖ = no significant change in performance

A regression test is an A/B test of target performance in a repeatable rig, where "performance" is measured as "comparison variant minus baseline variant" for an optimization goal (e.g., ingress throughput). Due to intrinsic variability in measuring that goal, we can only estimate its mean value for each experiment; we report uncertainty in that value as a 90.00% confidence interval denoted "Δ mean % CI".

For each experiment, we decide whether a change in performance is a "regression" -- a change worth investigating further -- if all of the following criteria are true:

Its estimated |Δ mean %| ≥ 5.00%, indicating the change is big enough to merit a closer look.
Its 90.00% confidence interval "Δ mean % CI" does not contain zero, indicating that if our statistical model is accurate, there is at least a 90.00% chance there is a difference in performance between baseline and comparison variants.
Its configuration does not mark it "erratic".

CI Pass/Fail Decision

✅ Passed. All Quality Gates passed.

quality_gate_metrics_logs, bounds check cpu_usage: 10/10 replicas passed. Gate passed.
quality_gate_metrics_logs, bounds check missed_bytes: 10/10 replicas passed. Gate passed.
quality_gate_metrics_logs, bounds check memory_usage: 10/10 replicas passed. Gate passed.
quality_gate_metrics_logs, bounds check intake_connections: 10/10 replicas passed. Gate passed.
quality_gate_idle_all_features, bounds check memory_usage: 10/10 replicas passed. Gate passed.
quality_gate_idle_all_features, bounds check intake_connections: 10/10 replicas passed. Gate passed.
quality_gate_logs, bounds check intake_connections: 10/10 replicas passed. Gate passed.
quality_gate_logs, bounds check memory_usage: 10/10 replicas passed. Gate passed.
quality_gate_logs, bounds check missed_bytes: 10/10 replicas passed. Gate passed.
quality_gate_idle, bounds check intake_connections: 10/10 replicas passed. Gate passed.
quality_gate_idle, bounds check memory_usage: 10/10 replicas passed. Gate passed.

For the advanced auto-config experiment. New optional field on integration.Config, populated by the auto_conf_discovery.yaml provider in a follow-up commit. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Recognise the discovery: block in the file format and populate integration.Config.Discovery. The file is picked up via the existing .yaml extension matcher; only the configFormat struct gains a new field and GetIntegrationConfigFromFile copies it into the returned integration.Config. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Hints first (when exposed), then remaining exposed ports in declared order. Dedup-aware. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Per-(serviceID, configHash) cache. Successes never expire; failures expire after caller-supplied TTL. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

HTTP-GET each candidate port + path with a 500ms per-probe budget and a 2s overall budget. Verify Content-Type is text/plain or application/openmetrics-text and that the body's first non-comment line is a Prometheus exposition line. Cache success/failure per (serviceID, config hash). Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Tiny shim so %%discovered_port%% resolution can flow through the existing GetExtraConfig path; no resolver signature change required. Also tightens fakeService.GetExtraConfig in the prober tests to error on unknown keys (matches the contract of real Service impls). Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Routes via Resolvable.GetExtraConfig("discovered_port"). Populated by autodiscovery/discovery's serviceWithProbeResult wrapper after a successful probe. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

When a Config has Discovery set, run the OpenMetrics prober against the matched Service before configresolver.Resolve. On match wrap the service so %%discovered_port%% resolves; on no match skip scheduling the check (logged at DEBUG). Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

SubstituteTemplateEnvVars is called at config-load time with a nil service. Without a nil check, GetDiscoveredPort panicked on res.GetExtraConfig. Match the pattern used by GetPort/GetPid/ GetHostname: return a NoResolverError early when res is nil so the caller can ignore it (config_reader.go:517 already does). Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

vitkyrka mentioned this pull request Apr 30, 2026

krakend: declarative auto_conf_discovery.yaml (advanced auto-config experiment) DataDog/integrations-core#23547

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dd-octo-sts Bot added internal Identify a non-fork PR team/container-platform The Container Platform Team team/agent-log-pipelines labels Apr 30, 2026

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vitkyrka and others added 10 commits May 5, 2026 21:35

autodiscovery/discovery: scaffold package with ProbeResult/Prober types

b9a278e

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

autodiscovery/discovery: candidate port ordering

4ab8e30

Hints first (when exposed), then remaining exposed ports in declared order. Dedup-aware. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

autodiscovery/discovery: TTL probe cache

aefef65

Per-(serviceID, configHash) cache. Successes never expire; failures expire after caller-supplied TTL. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

tmplvar: add %%discovered_port%% template variable

14ddf5f

Routes via Resolvable.GetExtraConfig("discovered_port"). Populated by autodiscovery/discovery's serviceWithProbeResult wrapper after a successful probe. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

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autodiscovery: declarative discovery probes (KrakenD experiment)#50199

autodiscovery: declarative discovery probes (KrakenD experiment)#50199
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Info

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Experiments ignored for regressions

Fine details of change detection per experiment

Bounds Checks: ✅ Passed

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vitkyrka commented Apr 30, 2026

Summary

Test plan

Known limitation (flagged for follow-up before any production rollout)

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Go Package Import Differences

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dd-octo-sts Bot commented Apr 30, 2026

Files inventory check summary

Results for datadog-agent_7.80.0~devel.git.400.6f34723.pipeline.110744978-1_amd64.deb:

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Static quality checks

Info

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Regression Detector

Regression Detector Results

Optimization Goals: ✅ No significant changes detected

Experiments ignored for regressions

Fine details of change detection per experiment

Bounds Checks: ✅ Passed

Explanation

CI Pass/Fail Decision

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