Add rules shared between cursor and claude

[KevinFairise2]

What does this PR do?

Create general guidelines for the AI agent using datadog-agent with a AGENTS.md file that is referenced in CLAUDE.md and cursor rules.

Was tested with Cursor and Claude, with that context the AI agent should be able to build the agent. "Build the agent" should create a core-agent binary, while being able to solve known error like CMake cache issue.

Motivation

Onboard coding Agent to datadog-agent

Describe how you validated your changes

Possible Drawbacks / Trade-offs

Additional Notes

That one is a first version that allows us to have a simple rule file shared between cursor and Claude. As a follow-up we want to put all the rules inside cursor rules and synchronized them so other agents can benefit from the cursor rules. That one is a first step that allows us to build the agent by asking cursor or claude

[chouetz]

I know this is not directly related to your change, but I did some suggestions on the main file. Thanks in advance

[agent-platform-auto-pr]

Static quality checks

✅ Please find below the results from static quality gates
Comparison made with ancestor 6d9476c

Successful checks

Info

	Quality gate	Delta	On disk size (MiB)	Delta	On wire size (MiB)
✅	agent_deb_amd64	$${0}$$	$${700.54}$$ < $${704.84}$$	$${+0.02}$$	$${177.19}$$ < $${178.58}$$
✅	agent_deb_amd64_fips	$${0}$$	$${687.82}$$ < $${703.09}$$	$${-0}$$	$${174.1}$$ < $${178.12}$$
✅	agent_heroku_amd64	$${0}$$	$${350.36}$$ < $${355.37}$$	$${+0}$$	$${94.01}$$ < $${95.72}$$
✅	agent_msi	$${0}$$	$${975.62}$$ < $${980.61}$$	$${-0}$$	$${150.14}$$ < $${152.67}$$
✅	agent_rpm_amd64	$${0}$$	$${700.53}$$ < $${704.83}$$	$${-0}$$	$${179.19}$$ < $${180.22}$$
✅	agent_rpm_amd64_fips	$${0}$$	$${687.81}$$ < $${703.08}$$	$${-0.03}$$	$${175.77}$$ < $${179.85}$$
✅	agent_rpm_arm64	$${0}$$	$${689.55}$$ < $${694.74}$$	$${-0.01}$$	$${161.71}$$ < $${163.96}$$
✅	agent_rpm_arm64_fips	$${0}$$	$${677.66}$$ < $${693.05}$$	$${+0.02}$$	$${158.42}$$ < $${163.0}$$
✅	agent_suse_amd64	$${0}$$	$${700.53}$$ < $${704.83}$$	$${-0}$$	$${179.19}$$ < $${180.22}$$
✅	agent_suse_amd64_fips	$${0}$$	$${687.81}$$ < $${703.08}$$	$${-0.03}$$	$${175.77}$$ < $${179.85}$$
✅	agent_suse_arm64	$${0}$$	$${689.55}$$ < $${694.74}$$	$${-0.01}$$	$${161.71}$$ < $${163.96}$$
✅	agent_suse_arm64_fips	$${0}$$	$${677.66}$$ < $${693.05}$$	$${+0.02}$$	$${158.42}$$ < $${163.0}$$
✅	docker_agent_amd64	$${-0}$$	$${782.95}$$ < $${788.65}$$	$${+0.01}$$	$${269.93}$$ < $${272.01}$$
✅	docker_agent_arm64	$${+0}$$	$${795.3}$$ < $${802.0}$$	$${-0}$$	$${256.7}$$ < $${259.7}$$
✅	docker_agent_jmx_amd64	$${-0}$$	$${973.82}$$ < $${979.84}$$	$${+0.01}$$	$${338.56}$$ < $${340.95}$$
✅	docker_agent_jmx_arm64	$${+0}$$	$${974.77}$$ < $${981.8}$$	$${+0}$$	$${321.31}$$ < $${324.65}$$
✅	docker_cluster_agent_amd64	$${0}$$	$${212.65}$$ < $${214.5}$$	$${+0}$$	$${72.21}$$ < $${73.51}$$
✅	docker_cluster_agent_arm64	$${-0}$$	$${228.61}$$ < $${230.33}$$	$${-0}$$	$${68.48}$$ < $${69.77}$$
✅	docker_cws_instrumentation_amd64	$${0}$$	$${7.07}$$ < $${7.12}$$	$${0}$$	$${2.95}$$ < $${3.29}$$
✅	docker_cws_instrumentation_arm64	$${0}$$	$${6.69}$$ < $${6.92}$$	$${-0}$$	$${2.71}$$ < $${3.07}$$
✅	docker_dogstatsd_amd64	$${0}$$	$${38.32}$$ < $${39.57}$$	$${+0}$$	$${14.81}$$ < $${15.76}$$
✅	docker_dogstatsd_arm64	$${0}$$	$${36.99}$$ < $${38.2}$$	$${0}$$	$${14.26}$$ < $${14.83}$$
✅	dogstatsd_deb_amd64	$${0}$$	$${29.55}$$ < $${31.4}$$	$${+0}$$	$${7.8}$$ < $${8.95}$$
✅	dogstatsd_deb_arm64	$${0}$$	$${28.14}$$ < $${29.97}$$	$${+0}$$	$${6.75}$$ < $${7.89}$$
✅	dogstatsd_rpm_amd64	$${0}$$	$${29.55}$$ < $${31.4}$$	$${-0}$$	$${7.81}$$ < $${8.96}$$
✅	dogstatsd_suse_amd64	$${0}$$	$${29.55}$$ < $${31.4}$$	$${-0}$$	$${7.81}$$ < $${8.96}$$
✅	iot_agent_deb_amd64	$${0}$$	$${54.15}$$ < $${54.55}$$	$${-0}$$	$${13.65}$$ < $${14.45}$$
✅	iot_agent_deb_arm64	$${0}$$	$${51.47}$$ < $${51.9}$$	$${-0}$$	$${11.82}$$ < $${12.63}$$
✅	iot_agent_deb_armhf	$${0}$$	$${51.02}$$ < $${51.42}$$	$${+0}$$	$${11.89}$$ < $${12.74}$$
✅	iot_agent_rpm_amd64	$${0}$$	$${54.15}$$ < $${54.55}$$	$${-0}$$	$${13.67}$$ < $${14.47}$$
✅	iot_agent_suse_amd64	$${0}$$	$${54.15}$$ < $${54.55}$$	$${-0}$$	$${13.67}$$ < $${14.47}$$

[cit-pr-commenter]

Regression Detector

Regression Detector Results

Metrics dashboard
Target profiles
Run ID: 07ac8bf2-2862-4bc9-8045-811bd75d9a9a

Baseline: 6d9476c
Comparison: 876931c
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	+4.88	[+1.73, +8.04]	1	Logs

Fine details of change detection per experiment

perf	experiment	goal	Δ mean %	Δ mean % CI	trials	links
➖	docker_containers_cpu	% cpu utilization	+4.88	[+1.73, +8.04]	1	Logs
➖	quality_gate_logs	% cpu utilization	+2.24	[-0.54, +5.02]	1	Logs bounds checks dashboard
➖	quality_gate_metrics_logs	memory utilization	+2.01	[+1.66, +2.37]	1	Logs bounds checks dashboard
➖	uds_dogstatsd_20mb_12k_contexts_20_senders	memory utilization	+0.27	[+0.23, +0.31]	1	Logs
➖	otlp_ingest_metrics	memory utilization	+0.07	[-0.08, +0.21]	1	Logs
➖	ddot_logs	memory utilization	+0.05	[-0.05, +0.16]	1	Logs
➖	file_to_blackhole_0ms_latency	egress throughput	+0.04	[-0.58, +0.66]	1	Logs
➖	tcp_dd_logs_filter_exclude	ingress throughput	+0.00	[-0.03, +0.03]	1	Logs
➖	file_to_blackhole_500ms_latency	egress throughput	+0.00	[-0.63, +0.63]	1	Logs
➖	file_to_blackhole_1000ms_latency	egress throughput	+0.00	[-0.60, +0.60]	1	Logs
➖	uds_dogstatsd_to_api	ingress throughput	-0.01	[-0.11, +0.09]	1	Logs
➖	quality_gate_idle	memory utilization	-0.05	[-0.09, -0.02]	1	Logs bounds checks dashboard
➖	file_to_blackhole_100ms_latency	egress throughput	-0.06	[-0.68, +0.57]	1	Logs
➖	quality_gate_idle_all_features	memory utilization	-0.15	[-0.18, -0.11]	1	Logs bounds checks dashboard
➖	tcp_syslog_to_blackhole	ingress throughput	-0.22	[-0.30, -0.14]	1	Logs
➖	file_tree	memory utilization	-0.54	[-0.59, -0.50]	1	Logs
➖	otlp_ingest_logs	memory utilization	-0.59	[-0.74, -0.44]	1	Logs
➖	ddot_metrics	memory utilization	-1.08	[-1.27, -0.89]	1	Logs
➖	docker_containers_memory	memory utilization	-2.50	[-2.69, -2.31]	1	Logs

Bounds Checks: ❌ Failed

perf	experiment	bounds_check_name	replicates_passed	links
✅	docker_containers_cpu	simple_check_run	10/10
✅	docker_containers_memory	memory_usage	10/10
❌	docker_containers_memory	simple_check_run	7/10
✅	file_to_blackhole_0ms_latency	lost_bytes	10/10
✅	file_to_blackhole_0ms_latency	memory_usage	10/10
✅	file_to_blackhole_1000ms_latency	memory_usage	10/10
✅	file_to_blackhole_100ms_latency	lost_bytes	10/10
✅	file_to_blackhole_100ms_latency	memory_usage	10/10
✅	file_to_blackhole_500ms_latency	lost_bytes	10/10
✅	file_to_blackhole_500ms_latency	memory_usage	10/10
✅	quality_gate_idle	intake_connections	10/10	bounds checks dashboard
✅	quality_gate_idle	memory_usage	10/10	bounds checks dashboard
✅	quality_gate_idle_all_features	intake_connections	10/10	bounds checks dashboard
✅	quality_gate_idle_all_features	memory_usage	10/10	bounds checks dashboard
✅	quality_gate_logs	intake_connections	10/10	bounds checks dashboard
✅	quality_gate_logs	lost_bytes	10/10	bounds checks dashboard
✅	quality_gate_logs	memory_usage	10/10	bounds checks dashboard
✅	quality_gate_metrics_logs	cpu_usage	10/10	bounds checks dashboard
✅	quality_gate_metrics_logs	intake_connections	10/10	bounds checks dashboard
✅	quality_gate_metrics_logs	lost_bytes	10/10	bounds checks dashboard
✅	quality_gate_metrics_logs	memory_usage	10/10	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:

1. Its estimated |Δ mean %| ≥ 5.00%, indicating the change is big enough to merit a closer look.

2. 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.

3. Its configuration does not mark it "erratic".

CI Pass/Fail Decision

✅ Passed. All Quality Gates 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 lost_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.
• quality_gate_metrics_logs, bounds check memory_usage: 10/10 replicas passed. Gate passed.
• quality_gate_metrics_logs, bounds check cpu_usage: 10/10 replicas passed. Gate passed.
• quality_gate_metrics_logs, bounds check intake_connections: 10/10 replicas passed. Gate passed.
• quality_gate_metrics_logs, bounds check lost_bytes: 10/10 replicas passed. Gate passed.
• quality_gate_idle_all_features, 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.

[KevinFairise2]

/merge

[dd-devflow-routing-codex]

View all feedbacks in Devflow UI.

2025-08-28 09:49:52 UTC ℹ️ Start processing command /merge

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2025-08-28 09:50:01 UTC ℹ️ MergeQueue: pull request added to the queue

The expected merge time in main is approximately 39m (p90).

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2025-08-28 10:14:41 UTC ℹ️ MergeQueue: This merge request was merged