[AMCC-11] dogstatsd: additional metric control mechanism between the sampler and the serializer #37692

remeh · 2025-06-05T14:52:17Z

What does this PR do?

Adds an additional processing step when the time samplers is flushing data to the serializer for serialization.
This extra step is necessary since the aggregation from the time sampler might possibly generate new metrics, that would not have been correctly visible to the metric control implementation which is running in the listening part of DogStatsD.

This implementation creates a sublist in order to avoid having to do a complete second pass with the configured list. This sublist contain only the metrics names generated from histograms, a heuristic try to do this using a static list of histogram aggregates and percentile suffixes.

Describe how you validated your changes

Manual tested E2E on an org with the feature enabled, also, will be extensively dogfooded.

…he flush to the serializer. This is to filter out metric names generated at the aggregation stage, in this case the histogram aggregates.

cit-pr-commenter · 2025-06-05T15:09:05Z

Go Package Import Differences

Baseline: cbd7198
Comparison: 17feff2

binary	os	arch	change
agent	linux	amd64	+1, -0 +github.com/DataDog/datadog-agent/pkg/util/strings
agent	linux	arm64	+1, -0 +github.com/DataDog/datadog-agent/pkg/util/strings
agent	darwin	amd64	+1, -0 +github.com/DataDog/datadog-agent/pkg/util/strings
agent	darwin	arm64	+1, -0 +github.com/DataDog/datadog-agent/pkg/util/strings
iot-agent	linux	amd64	+1, -0 +github.com/DataDog/datadog-agent/pkg/util/strings
iot-agent	linux	arm64	+1, -0 +github.com/DataDog/datadog-agent/pkg/util/strings
heroku-agent	linux	amd64	+1, -0 +github.com/DataDog/datadog-agent/pkg/util/strings
cluster-agent	linux	amd64	+1, -0 +github.com/DataDog/datadog-agent/pkg/util/strings
cluster-agent	linux	arm64	+1, -0 +github.com/DataDog/datadog-agent/pkg/util/strings
cluster-agent-cloudfoundry	linux	amd64	+1, -0 +github.com/DataDog/datadog-agent/pkg/util/strings
cluster-agent-cloudfoundry	linux	arm64	+1, -0 +github.com/DataDog/datadog-agent/pkg/util/strings
dogstatsd	linux	amd64	+1, -0 +github.com/DataDog/datadog-agent/pkg/util/strings
dogstatsd	linux	arm64	+1, -0 +github.com/DataDog/datadog-agent/pkg/util/strings
serverless	linux	amd64	+1, -0 +github.com/DataDog/datadog-agent/pkg/util/strings
serverless	linux	arm64	+1, -0 +github.com/DataDog/datadog-agent/pkg/util/strings

cit-pr-commenter · 2025-06-05T15:50:43Z

Regression Detector

Regression Detector Results

Metrics dashboard
Target profiles
Run ID: 3280fd8f-7ef8-4538-9a90-4a265c7f6bdc

Baseline: cbd7198
Comparison: 17feff2
Diff

Optimization Goals: ✅ No significant changes detected

Fine details of change detection per experiment

perf	experiment	goal	Δ mean %	Δ mean % CI	trials	links
➖	tcp_syslog_to_blackhole	ingress throughput	+0.51	[+0.44, +0.57]	1	Logs
➖	quality_gate_logs	% cpu utilization	+0.40	[-2.34, +3.14]	1	Logs bounds checks dashboard
➖	otlp_ingest_metrics	memory utilization	+0.32	[+0.16, +0.49]	1	Logs
➖	quality_gate_idle_all_features	memory utilization	+0.32	[+0.24, +0.39]	1	Logs bounds checks dashboard
➖	uds_dogstatsd_20mb_12k_contexts_20_senders	memory utilization	+0.27	[+0.23, +0.31]	1	Logs
➖	file_to_blackhole_0ms_latency_http2	egress throughput	+0.12	[-0.52, +0.75]	1	Logs
➖	ddot_logs	memory utilization	+0.11	[-0.03, +0.26]	1	Logs
➖	ddot_metrics	memory utilization	+0.09	[-0.02, +0.21]	1	Logs
➖	file_to_blackhole_0ms_latency	egress throughput	+0.08	[-0.50, +0.66]	1	Logs
➖	file_to_blackhole_1000ms_latency_linear_load	egress throughput	+0.05	[-0.18, +0.28]	1	Logs
➖	file_to_blackhole_0ms_latency_http1	egress throughput	+0.03	[-0.57, +0.64]	1	Logs
➖	file_to_blackhole_500ms_latency	egress throughput	+0.02	[-0.58, +0.62]	1	Logs
➖	file_to_blackhole_300ms_latency	egress throughput	+0.00	[-0.62, +0.62]	1	Logs
➖	uds_dogstatsd_to_api	ingress throughput	+0.00	[-0.29, +0.30]	1	Logs
➖	tcp_dd_logs_filter_exclude	ingress throughput	+0.00	[-0.01, +0.02]	1	Logs
➖	file_to_blackhole_1000ms_latency	egress throughput	-0.02	[-0.64, +0.61]	1	Logs
➖	file_to_blackhole_100ms_latency	egress throughput	-0.10	[-0.68, +0.48]	1	Logs
➖	quality_gate_idle	memory utilization	-0.28	[-0.34, -0.22]	1	Logs bounds checks dashboard
➖	docker_containers_memory	memory utilization	-0.74	[-0.81, -0.66]	1	Logs
➖	uds_dogstatsd_to_api_cpu	% cpu utilization	-0.84	[-1.74, +0.05]	1	Logs
➖	otlp_ingest_logs	memory utilization	-0.87	[-1.00, -0.74]	1	Logs
➖	docker_containers_cpu	% cpu utilization	-2.79	[-5.84, +0.25]	1	Logs
➖	file_tree	memory utilization	-4.58	[-4.78, -4.39]	1	Logs

Bounds Checks: ✅ Passed

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	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_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

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_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.
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_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_logs, bounds check memory_usage: 10/10 replicas passed. Gate passed.

agent-platform-auto-pr · 2025-06-05T16:38:19Z

Static quality checks

✅ Please find below the results from static quality gates
Comparison made with ancestor cbd7198

Successful checks

Info

	Quality gate	Delta	On disk size (MiB)	Delta	On wire size (MiB)
✅	agent_deb_amd64	$${+0}$$	$${696.04}$$ < $${752.99}$$	$${+0.04}$$	$${176.06}$$ < $${187.44}$$
✅	agent_deb_amd64_fips	$${+0.01}$$	$${694.27}$$ < $${751.36}$$	$${+0.02}$$	$${175.48}$$ < $${187.06}$$
✅	agent_heroku_amd64	$${+0}$$	$${358.56}$$ < $${369.68}$$	$${+0}$$	$${96.5}$$ < $${99.55}$$
✅	agent_msi	$${+0.02}$$	$${959.87}$$ < $${987.01}$$	$${+0.02}$$	$${146.45}$$ < $${150.72}$$
✅	agent_rpm_amd64	$${+0}$$	$${696.03}$$ < $${752.98}$$	$${+0.06}$$	$${177.55}$$ < $${190.03}$$
✅	agent_rpm_amd64_fips	$${+0.01}$$	$${694.26}$$ < $${751.35}$$	$${+0.03}$$	$${177.43}$$ < $${189.81}$$
✅	agent_rpm_arm64	$${+0}$$	$${685.98}$$ < $${739.42}$$	$${+0.06}$$	$${161.05}$$ < $${171.23}$$
✅	agent_rpm_arm64_fips	$${+0}$$	$${684.33}$$ < $${737.91}$$	$${-0.01}$$	$${160.07}$$ < $${170.22}$$
✅	agent_suse_amd64	$${+0}$$	$${696.03}$$ < $${752.98}$$	$${+0.06}$$	$${177.55}$$ < $${190.03}$$
✅	agent_suse_amd64_fips	$${+0.01}$$	$${694.26}$$ < $${751.35}$$	$${+0.03}$$	$${177.43}$$ < $${189.81}$$
✅	agent_suse_arm64	$${+0}$$	$${685.98}$$ < $${739.42}$$	$${+0.06}$$	$${161.05}$$ < $${171.23}$$
✅	agent_suse_arm64_fips	$${+0}$$	$${684.33}$$ < $${737.91}$$	$${-0.01}$$	$${160.07}$$ < $${170.22}$$
✅	docker_agent_amd64	$${+0}$$	$${779.83}$$ < $${849.39}$$	$${-0}$$	$${268.58}$$ < $${288.34}$$
✅	docker_agent_arm64	$${+0}$$	$${793.23}$$ < $${858.97}$$	$${+0.01}$$	$${255.97}$$ < $${274.36}$$
✅	docker_agent_jmx_amd64	$${+0}$$	$${779.83}$$ < $${849.39}$$	$${-0}$$	$${268.58}$$ < $${288.34}$$
✅	docker_agent_jmx_arm64	$${+0}$$	$${793.23}$$ < $${858.97}$$	$${+0.01}$$	$${255.97}$$ < $${274.36}$$
✅	docker_agent_windows1809	$${+0}$$	$${779.83}$$ < $${849.39}$$	$${-0}$$	$${268.58}$$ < $${288.34}$$
✅	docker_agent_windows1809_core	$${+0}$$	$${779.83}$$ < $${849.39}$$	$${-0}$$	$${268.58}$$ < $${288.34}$$
✅	docker_agent_windows1809_core_jmx	$${+0}$$	$${779.83}$$ < $${849.39}$$	$${-0}$$	$${268.58}$$ < $${288.34}$$
✅	docker_agent_windows1809_jmx	$${+0}$$	$${779.83}$$ < $${849.39}$$	$${-0}$$	$${268.58}$$ < $${288.34}$$
✅	docker_agent_windows2022	$${+0}$$	$${779.83}$$ < $${849.39}$$	$${-0}$$	$${268.58}$$ < $${288.34}$$
✅	docker_agent_windows2022_core	$${+0}$$	$${779.83}$$ < $${849.39}$$	$${-0}$$	$${268.58}$$ < $${288.34}$$
✅	docker_agent_windows2022_core_jmx	$${+0}$$	$${779.83}$$ < $${849.39}$$	$${-0}$$	$${268.58}$$ < $${288.34}$$
✅	docker_agent_windows2022_jmx	$${+0}$$	$${779.83}$$ < $${849.39}$$	$${-0}$$	$${268.58}$$ < $${288.34}$$
✅	docker_cluster_agent_amd64	$${+0.01}$$	$${259.19}$$ < $${259.73}$$	$${+0.01}$$	$${102.89}$$ < $${103.68}$$
✅	docker_cluster_agent_arm64	$${+0}$$	$${273.58}$$ < $${274.24}$$	$${-0}$$	$${97.59}$$ < $${98.45}$$
✅	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	$${+0}$$	$${38.93}$$ < $${39.57}$$	$${+0}$$	$${14.95}$$ < $${15.76}$$
✅	docker_dogstatsd_arm64	$${0}$$	$${37.52}$$ < $${38.2}$$	$${+0}$$	$${13.96}$$ < $${14.83}$$
✅	dogstatsd_deb_amd64	$${0}$$	$${30.61}$$ < $${31.52}$$	$${-0}$$	$${8.03}$$ < $${8.97}$$
✅	dogstatsd_deb_arm64	$${+0}$$	$${29.16}$$ < $${30.08}$$	$${-0}$$	$${6.98}$$ < $${7.92}$$
✅	dogstatsd_rpm_amd64	$${0}$$	$${30.61}$$ < $${31.52}$$	$${+0}$$	$${8.04}$$ < $${8.98}$$
✅	dogstatsd_suse_amd64	$${0}$$	$${30.61}$$ < $${31.52}$$	$${+0}$$	$${8.04}$$ < $${8.98}$$
✅	iot_agent_deb_amd64	$${+0.01}$$	$${50.49}$$ < $${60.17}$$	$${-0}$$	$${12.85}$$ < $${15.82}$$
✅	iot_agent_deb_arm64	$${+0}$$	$${47.94}$$ < $${56.94}$$	$${+0}$$	$${11.15}$$ < $${13.86}$$
✅	iot_agent_deb_armhf	$${+0.01}$$	$${47.52}$$ < $${56.41}$$	$${+0.01}$$	$${11.21}$$ < $${13.86}$$
✅	iot_agent_rpm_amd64	$${+0.01}$$	$${50.49}$$ < $${60.18}$$	$${+0}$$	$${12.87}$$ < $${15.84}$$
✅	iot_agent_rpm_arm64	$${+0}$$	$${47.94}$$ < $${56.94}$$	$${+0}$$	$${11.16}$$ < $${13.76}$$
✅	iot_agent_suse_amd64	$${+0.01}$$	$${50.49}$$ < $${60.18}$$	$${+0}$$	$${12.87}$$ < $${15.84}$$

pgimalac

LGTM for Agent Runtimes

comp/dogstatsd/server/server.go

This reverts commit 36f0629.

…ion)

vickenty

Left some cosmetic comments, but otherwise LGTM.

pkg/aggregator/time_sampler_worker.go

pkg/aggregator/demultiplexer.go

vickenty · 2025-06-06T13:43:58Z

comp/dogstatsd/server/server.go

+func (s *server) createHistogramsBlocklist(metricNames []string) []string {
+	aggrs := s.config.GetStringSlice("histogram_aggregates")
+
+	percentiles := metrics.ParsePercentiles(s.config.GetStringSlice("histogram_percentiles"))


Would it make sense to move this function to the metrics package? So that all handling of percentiles is concentrated in one, rather than multiple packages.

It's use-case is IMO closer to statsd than the percentiles/histograms themselves, don't you think?

pkg/aggregator/time_sampler.go

vickenty · 2025-06-06T13:50:46Z

pkg/aggregator/time_sampler.go

@@ -124,7 +125,7 @@ func (s *TimeSampler) newSketchSeries(ck ckey.ContextKey, points []metrics.Sketc
 	return ss
 }

-func (s *TimeSampler) flushSeries(cutoffTime int64, series metrics.SerieSink) {
+func (s *TimeSampler) flushSeries(cutoffTime int64, series metrics.SerieSink, blocklist *utilstrings.Blocklist) {


Rather than plumbing it through the entire flush call chain, would it make sense to store the blocklist directly in the time sampler, rather than the worker? That way we will need to refer to it only in two places.

The TimeSampler isn't waiting on a select or anything, each one are actually managed by the TimeSamplerWorker. I'm not sure that it would decrease the size of the chain since it would be on the worker to pass the list to the sampler: AFAIU (only checked quickly) the worker would still have the plumbing to pass the list to the sampler, it would just be stored somewhere else. Please let me know if you think I should look more into this, I can address it in a separate PR.

olivielpeau

Thanks! LGTM, I left a few comments inline but none of them are blockers (feel free to either address them or discard them with an explanation)

olivielpeau · 2025-06-06T13:40:27Z

comp/dogstatsd/server/server.go

+func (s *server) createHistogramsBlocklist(metricNames []string) []string {
+	aggrs := s.config.GetStringSlice("histogram_aggregates")
+
+	percentiles := metrics.ParsePercentiles(s.config.GetStringSlice("histogram_percentiles"))


Instead of GetStringSlice("histogram_percentiles"), pkg/metrics/histogram uses structure.UnmarshalKey(config, "histogram_percentiles", &c). I'm not sure why but I think it's worth digging into it and making both config accesses consistent

comp/dogstatsd/server/server.go

pkg/aggregator/time_sampler_worker.go

remeh · 2025-06-10T07:36:44Z

/merge

dd-devflow · 2025-06-10T07:36:49Z

View all feedbacks in Devflow UI.

2025-06-10 07:36:48 UTC ℹ️ Start processing command /merge

2025-06-10 07:36:53 UTC ℹ️ MergeQueue: pull request added to the queue

The expected merge time in main is approximately 46m (p90).

2025-06-10 08:23:46 UTC ℹ️ MergeQueue: This merge request was merged

…sampler and the serializer (#37692) (cherry picked from commit ac84213)

remeh added 2 commits June 5, 2025 16:42

misc: turning the blocklist into a strings blocklist helper

514dfe4

dogstatsd: apply a metric names filter between the time sampler and t…

09887ed

…he flush to the serializer. This is to filter out metric names generated at the aggregation stage, in this case the histogram aggregates.

remeh requested review from a team as code owners June 5, 2025 14:52

remeh requested a review from pgimalac June 5, 2025 14:52

remeh added changelog/no-changelog qa/done QA done before merge and regressions are covered by tests labels Jun 5, 2025

github-actions bot added the long review PR is complex, plan time to review it label Jun 5, 2025

remeh added 3 commits June 6, 2025 09:32

empty commit for SMP

7bf5e73

the dot char isn't properly escaped in the regexp

40db570

and there might be only one digit

d593be5

pgimalac approved these changes Jun 6, 2025

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remeh force-pushed the remeh/rc-bl-histograms branch from 2acee9f to e127d1d Compare June 6, 2025 09:00

use a fixed list of histogram aggregates instead

36f0629

remeh force-pushed the remeh/rc-bl-histograms branch from e127d1d to 36f0629 Compare June 6, 2025 09:25

olivielpeau reviewed Jun 6, 2025

View reviewed changes

comp/dogstatsd/server/server.go Outdated Show resolved Hide resolved

Revert "use a fixed list of histogram aggregates instead"

fd3c70c

This reverts commit 36f0629.

remeh force-pushed the remeh/rc-bl-histograms branch from cffb4e8 to 7558cd5 Compare June 6, 2025 10:14

rely on the same logic than for the percentiles (using the configurat…

159f026

…ion)

remeh force-pushed the remeh/rc-bl-histograms branch from 7558cd5 to 159f026 Compare June 6, 2025 10:19

make the linter happy

64ddea3

vickenty approved these changes Jun 6, 2025

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olivielpeau approved these changes Jun 6, 2025

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remeh added 3 commits June 8, 2025 12:01

address PR feedback

e5cbb14

Merge branch 'main' into remeh/rc-bl-histograms

6bed7e2

Merge branch 'main' into remeh/rc-bl-histograms

17feff2

dd-mergequeue bot merged commit ac84213 into main Jun 10, 2025
238 checks passed

dd-mergequeue bot deleted the remeh/rc-bl-histograms branch June 10, 2025 08:23

github-actions bot added this to the 7.68.0 milestone Jun 10, 2025

remeh added the backport/7.67.x Automatically create a backport PR to 7.67.x label Jun 10, 2025

agent-platform-auto-pr bot pushed a commit that referenced this pull request Jun 10, 2025

[AMCC-11] dogstatsd: additional metric control mechanism between the …

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…sampler and the serializer (#37692) (cherry picked from commit ac84213)

agent-platform-auto-pr bot mentioned this pull request Jun 10, 2025

[Backport 7.67.x] [AMCC-11] dogstatsd: additional metric control mechanism between the sampler and the serializer #37828

Merged

[AMCC-11] dogstatsd: additional metric control mechanism between the sampler and the serializer #37692

[AMCC-11] dogstatsd: additional metric control mechanism between the sampler and the serializer #37692

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Describe how you validated your changes

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Go Package Import Differences

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Regression Detector

Regression Detector Results

Optimization Goals: ✅ No significant changes detected

Fine details of change detection per experiment

Bounds Checks: ✅ Passed

Explanation

CI Pass/Fail Decision

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Static quality checks

Info

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