wlm: process: allow SD collector to work when process collection is disabled

[Yumasi]

What does this PR do?

This PR allows the process collector to run when process collection is disabled, only collecting service information and storing Service Discovery only fields.

Motivation

Handle the case where process collection is disabled.

Describe how you validated your changes

Unit tests are included, and were run, but are skipped until the configuration is no longer hardcoded.

The change was also tested manually by:

• Changing the return value of isServiceDiscoveryEnabled to true
• Run processes that look like a service: Python HTTP server, postgres, rails server.
• Running the agent and system-probe, and run agent workload-list. Only service information should be present on the output. Example:

vagrant@agent-dev-ubuntu-22:/git/datadog-agent$ ./bin/agent/agent workload-list -c ./dev/dist/datadog.yaml --sysprobecfgpath ./dev/dist/system-probe.yaml | rg -A 10 'Entity process'
=== Entity process sources(merged):[service_discovery] id: 563793 ===
----------- Entity ID -----------
PID: 563793
Namespace PID: 0
Container ID:
Creation time: 2025-06-24 12:43:52 +0000 UTC
Service Generated Name: agent
===

=== Entity process sources(merged):[service_discovery] id: 921 ===
----------- Entity ID -----------
PID: 921
Namespace PID: 0
Container ID:
Creation time: 2025-06-22 20:42:10 +0000 UTC
Service Generated Name: postgres
===

=== Entity process sources(merged):[service_discovery] id: 993737 ===
----------- Entity ID -----------
PID: 993737
Namespace PID: 0
Container ID:
Creation time: 2025-06-23 12:12:39 +0000 UTC
Service Generated Name: rails_hello
===

=== Entity process sources(merged):[service_discovery] id: 1346514 ===
----------- Entity ID -----------
PID: 1346514
Namespace PID: 0
Container ID:
Creation time: 2025-06-24 01:57:43 +0000 UTC
Service Generated Name: node
===

Possible Drawbacks / Trade-offs

Additional Notes

[cit-pr-commenter[bot]]

Regression Detector

Regression Detector Results

Metrics dashboard
Target profiles
Run ID: 52ee6de6-4643-4dbc-b072-c787c6b402ba

Baseline: 2c3712cf88443c30601cd7a13dfccf02972e275b Comparison: aebd6f3972c2692b291e98254c88975aa2a71301 Diff

Optimization Goals: ✅ No significant changes detected

Fine details of change detection per experiment

perf	experiment	goal	Δ mean %	Δ mean % CI	trials	links
➖	uds_dogstatsd_20mb_12k_contexts_20_senders	memory utilization	+1.08	[+1.01, +1.15]	1	Logs
➖	file_tree	memory utilization	+0.51	[+0.35, +0.66]	1	Logs
➖	otlp_ingest_logs	memory utilization	+0.45	[+0.32, +0.58]	1	Logs
➖	file_to_blackhole_100ms_latency	egress throughput	+0.13	[-0.47, +0.72]	1	Logs
➖	file_to_blackhole_500ms_latency	egress throughput	+0.10	[-0.51, +0.71]	1	Logs
➖	file_to_blackhole_0ms_latency	egress throughput	+0.07	[-0.53, +0.67]	1	Logs
➖	file_to_blackhole_0ms_latency_http1	egress throughput	+0.04	[-0.57, +0.65]	1	Logs
➖	file_to_blackhole_300ms_latency	egress throughput	+0.02	[-0.57, +0.62]	1	Logs
➖	file_to_blackhole_1000ms_latency_linear_load	egress throughput	+0.02	[-0.21, +0.25]	1	Logs
➖	uds_dogstatsd_to_api	ingress throughput	+0.01	[-0.27, +0.29]	1	Logs
➖	tcp_dd_logs_filter_exclude	ingress throughput	+0.00	[-0.02, +0.02]	1	Logs
➖	file_to_blackhole_0ms_latency_http2	egress throughput	-0.03	[-0.63, +0.57]	1	Logs
➖	docker_containers_cpu	% cpu utilization	-0.03	[-3.16, +3.10]	1	Logs
➖	file_to_blackhole_1000ms_latency	egress throughput	-0.04	[-0.65, +0.57]	1	Logs
➖	ddot_metrics	memory utilization	-0.11	[-0.23, +0.00]	1	Logs
➖	ddot_logs	memory utilization	-0.17	[-0.26, -0.08]	1	Logs
➖	otlp_ingest_metrics	memory utilization	-0.17	[-0.33, -0.02]	1	Logs
➖	quality_gate_idle_all_features	memory utilization	-0.25	[-0.35, -0.15]	1	Logs bounds checks dashboard
➖	quality_gate_idle	memory utilization	-0.34	[-0.41, -0.27]	1	Logs bounds checks dashboard
➖	uds_dogstatsd_to_api_cpu	% cpu utilization	-0.69	[-1.56, +0.18]	1	Logs
➖	tcp_syslog_to_blackhole	ingress throughput	-1.93	[-2.02, -1.85]	1	Logs
➖	quality_gate_logs	% cpu utilization	-2.06	[-4.84, +0.73]	1	Logs bounds checks dashboard
➖	docker_containers_memory	memory utilization	-2.81	[-2.97, -2.66]	1	Logs

Bounds Checks: ❌ Failed

perf	experiment	bounds_check_name	replicates_passed	links
❌	quality_gate_logs	memory_usage	7/10	bounds checks dashboard
❌	quality_gate_idle_all_features	memory_usage	8/10	bounds checks dashboard
✅	docker_containers_cpu	simple_check_run	10/10
✅	docker_containers_memory	memory_usage	10/10
✅	docker_containers_memory	simple_check_run	10/10
✅	file_to_blackhole_0ms_latency	lost_bytes	10/10
✅	file_to_blackhole_0ms_latency	memory_usage	10/10
✅	file_to_blackhole_0ms_latency_http1	lost_bytes	10/10
✅	file_to_blackhole_0ms_latency_http1	memory_usage	10/10
✅	file_to_blackhole_0ms_latency_http2	lost_bytes	10/10
✅	file_to_blackhole_0ms_latency_http2	memory_usage	10/10
✅	file_to_blackhole_1000ms_latency	memory_usage	10/10
✅	file_to_blackhole_1000ms_latency_linear_load	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_300ms_latency	lost_bytes	10/10
✅	file_to_blackhole_300ms_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_logs	intake_connections	10/10	bounds checks dashboard
✅	quality_gate_logs	lost_bytes	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

❌ Failed. Some Quality Gates were violated.

• quality_gate_idle_all_features, bounds check intake_connections: 10/10 replicas passed. Gate passed.
• quality_gate_idle_all_features, bounds check memory_usage: 8/10 replicas passed. Failed 2 which is > 0. Gate FAILED.
• quality_gate_logs, bounds check memory_usage: 7/10 replicas passed. Failed 3 which is > 0. Gate FAILED.
• quality_gate_logs, bounds check lost_bytes: 10/10 replicas passed. Gate passed.
• quality_gate_logs, 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_idle, bounds check intake_connections: 10/10 replicas passed. Gate passed.

[agent-platform-auto-pr[bot]]

Static quality checks

✅ Please find below the results from static quality gates Comparison made with ancestor 2c3712cf88443c30601cd7a13dfccf02972e275b

Successful checks

Info

	Quality gate	Delta	On disk size (MiB)	Delta	On wire size (MiB)
✅	agent_deb_amd64	$${0}$$	$${699.16}$$ < $${700.55}$$	$${+0.01}$$	$${176.57}$$ < $${177.62}$$
✅	agent_deb_amd64_fips	$${0}$$	$${697.42}$$ < $${699.75}$$	$${+0.03}$$	$${176.02}$$ < $${177.04}$$
✅	agent_heroku_amd64	$${0}$$	$${352.31}$$ < $${362.84}$$	$${+0}$$	$${95.12}$$ < $${98.91}$$
✅	agent_msi	$${0}$$	$${973.39}$$ < $${973.9}$$	$${-0.02}$$	$${147.13}$$ < $${148.11}$$
✅	agent_rpm_amd64	$${0}$$	$${699.15}$$ < $${700.53}$$	$${-0.04}$$	$${178.27}$$ < $${179.2}$$
✅	agent_rpm_amd64_fips	$${0}$$	$${697.41}$$ < $${699.74}$$	$${-0.04}$$	$${177.83}$$ < $${178.75}$$
✅	agent_rpm_arm64	$${0}$$	$${689.02}$$ < $${690.5}$$	$${+0}$$	$${161.61}$$ < $${162.56}$$
✅	agent_rpm_arm64_fips	$${0}$$	$${687.4}$$ < $${689.8}$$	$${-0.01}$$	$${160.71}$$ < $${161.61}$$
✅	agent_suse_amd64	$${0}$$	$${699.15}$$ < $${700.54}$$	$${-0.04}$$	$${178.27}$$ < $${179.2}$$
✅	agent_suse_amd64_fips	$${0}$$	$${697.41}$$ < $${699.74}$$	$${-0.04}$$	$${177.83}$$ < $${178.93}$$
✅	agent_suse_arm64	$${0}$$	$${689.02}$$ < $${690.43}$$	$${+0}$$	$${161.61}$$ < $${162.57}$$
✅	agent_suse_arm64_fips	$${0}$$	$${687.4}$$ < $${689.78}$$	$${-0.01}$$	$${160.71}$$ < $${161.61}$$
✅	docker_agent_amd64	$${+0}$$	$${782.95}$$ < $${784.33}$$	$${-0}$$	$${269.59}$$ < $${270.56}$$
✅	docker_agent_arm64	$${-0}$$	$${796.27}$$ < $${797.68}$$	$${+0}$$	$${256.89}$$ < $${257.84}$$
✅	docker_agent_jmx_amd64	$${+0}$$	$${974.14}$$ < $${975.52}$$	$${-0}$$	$${338.58}$$ < $${339.53}$$
✅	docker_agent_jmx_arm64	$${0}$$	$${976.06}$$ < $${977.47}$$	$${+0.01}$$	$${321.85}$$ < $${322.81}$$
✅	docker_agent_windows1809	$${-0.07}$$	$${1184.98}$$ < $${1190.0}$$	$${+0.01}$$	$${417.38}$$ < $${422.66}$$
✅	docker_agent_windows1809_core	$${+0}$$	$${5915.01}$$ < $${5919.41}$$	$${0}$$	$${2048.0}$$ < $${2049.0}$$
✅	docker_agent_windows1809_core_jmx	$${+0.2}$$	$${6036.77}$$ < $${6063.56}$$	$${0}$$	$${2048.0}$$ < $${2049.0}$$
✅	docker_agent_windows1809_jmx	$${-0}$$	$${1306.67}$$ < $${1311.1}$$	$${+0}$$	$${459.65}$$ < $${464.35}$$
✅	docker_agent_windows2022	$${+0.33}$$	$${1204.47}$$ < $${1208.75}$$	$${+0.05}$$	$${430.18}$$ < $${434.91}$$
✅	docker_agent_windows2022_core	$${-0}$$	$${5888.1}$$ < $${5892.66}$$	$${0}$$	$${2048.0}$$ < $${2049.0}$$
✅	docker_agent_windows2022_core_jmx	$${+0}$$	$${6009.74}$$ < $${6014.08}$$	$${0}$$	$${2048.0}$$ < $${2049.0}$$
✅	docker_agent_windows2022_jmx	$${+0.33}$$	$${1326.06}$$ < $${1330.39}$$	$${-0.03}$$	$${472.4}$$ < $${477.17}$$
✅	docker_cluster_agent_amd64	$${-0}$$	$${213.64}$$ < $${214.5}$$	$${-0}$$	$${72.6}$$ < $${73.51}$$
✅	docker_cluster_agent_arm64	$${-0}$$	$${229.43}$$ < $${230.33}$$	$${+0}$$	$${68.86}$$ < $${69.77}$$
✅	docker_cws_instrumentation_amd64	$${0}$$	$${7.08}$$ < $${7.12}$$	$${-0}$$	$${2.95}$$ < $${3.29}$$
✅	docker_cws_instrumentation_arm64	$${0}$$	$${6.69}$$ < $${6.92}$$	$${-0}$$	$${2.7}$$ < $${3.07}$$
✅	docker_dogstatsd_amd64	$${0}$$	$${39.23}$$ < $${39.57}$$	$${-0}$$	$${15.12}$$ < $${15.76}$$
✅	docker_dogstatsd_arm64	$${+0}$$	$${37.88}$$ < $${38.2}$$	$${-0}$$	$${14.53}$$ < $${14.83}$$
✅	dogstatsd_deb_amd64	$${0}$$	$${30.46}$$ < $${31.4}$$	$${-0}$$	$${8.0}$$ < $${8.95}$$
✅	dogstatsd_deb_arm64	$${0}$$	$${29.03}$$ < $${29.97}$$	$${+0}$$	$${6.94}$$ < $${7.89}$$
✅	dogstatsd_rpm_amd64	$${0}$$	$${30.46}$$ < $${31.4}$$	$${+0}$$	$${8.01}$$ < $${8.96}$$
✅	dogstatsd_suse_amd64	$${0}$$	$${30.46}$$ < $${31.4}$$	$${+0}$$	$${8.01}$$ < $${8.96}$$
✅	iot_agent_deb_amd64	$${0}$$	$${53.7}$$ < $${54.55}$$	$${-0}$$	$${13.52}$$ < $${14.45}$$
✅	iot_agent_deb_arm64	$${0}$$	$${51.06}$$ < $${51.9}$$	$${+0}$$	$${11.7}$$ < $${12.63}$$
✅	iot_agent_deb_armhf	$${0}$$	$${50.57}$$ < $${51.42}$$	$${-0.03}$$	$${11.78}$$ < $${12.74}$$
✅	iot_agent_rpm_amd64	$${0}$$	$${53.71}$$ < $${54.55}$$	$${+0}$$	$${13.54}$$ < $${14.47}$$
✅	iot_agent_rpm_arm64	$${0}$$	$${51.06}$$ < $${51.91}$$	$${-0}$$	$${11.72}$$ < $${12.65}$$
✅	iot_agent_suse_amd64	$${0}$$	$${53.71}$$ < $${54.55}$$	$${+0}$$	$${13.54}$$ < $${14.47}$$

[Yumasi]

/merge

[dd-devflow[bot]]

View all feedbacks in Devflow UI.

2025-07-02 13:05:09 UTC :information_source: Start processing command /merge

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2025-07-02 13:05:24 UTC :information_source: MergeQueue: waiting for PR to be ready

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2025-07-02 15:15:29 UTC :information_source: MergeQueue: merge request added to the queue

The expected merge time in main is approximately 47m (p90).

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2025-07-02 15:53:39 UTC :information_source: MergeQueue: This merge request was merged