logs: shared & distributed senders implementation

[remeh]

What does this PR do?

Motivation

Describe how you validated your changes

Possible Drawbacks / Trade-offs

Additional Notes

[agent-platform-auto-pr]

Uncompressed package size comparison

Comparison with ancestor 1cd59eb201b892b1abe876c704db0daf5e2dc719

Diff per package

package	diff	status	size	ancestor	threshold
datadog-agent-x86_64-rpm	0.04MB	⚠️	1020.70MB	1020.66MB	140.00MB
datadog-agent-x86_64-suse	0.04MB	⚠️	1020.70MB	1020.66MB	140.00MB
datadog-agent-amd64-deb	0.04MB	⚠️	1011.38MB	1011.35MB	140.00MB
datadog-heroku-agent-amd64-deb	0.02MB	⚠️	506.17MB	506.15MB	70.00MB
datadog-iot-agent-x86_64-rpm	0.01MB	⚠️	113.88MB	113.87MB	10.00MB
datadog-iot-agent-x86_64-suse	0.01MB	⚠️	113.88MB	113.87MB	10.00MB
datadog-iot-agent-amd64-deb	0.01MB	⚠️	113.81MB	113.80MB	10.00MB
datadog-iot-agent-arm64-deb	0.01MB	⚠️	109.26MB	109.25MB	10.00MB
datadog-iot-agent-aarch64-rpm	0.01MB	⚠️	109.33MB	109.32MB	10.00MB
datadog-dogstatsd-arm64-deb	0.01MB	⚠️	56.14MB	56.13MB	10.00MB
datadog-dogstatsd-x86_64-rpm	0.00MB	✅	58.70MB	58.70MB	10.00MB
datadog-dogstatsd-x86_64-suse	0.00MB	✅	58.70MB	58.70MB	10.00MB
datadog-agent-aarch64-rpm	0.00MB	✅	950.01MB	950.01MB	140.00MB
datadog-dogstatsd-amd64-deb	0.00MB	✅	58.62MB	58.62MB	10.00MB
datadog-agent-arm64-deb	0.00MB	✅	940.71MB	940.71MB	140.00MB

Decision

⚠️ Warning

[agent-platform-auto-pr]

Test changes on VM

Use this command from test-infra-definitions to manually test this PR changes on a VM:

inv aws.create-vm --pipeline-id=52551571 --os-family=ubuntu

Note: This applies to commit 5d683fb

[cit-pr-commenter]

Regression Detector

Regression Detector Results

Metrics dashboard
Target profiles
Run ID: 69b8fc91-993a-495c-b183-ecb5340ef276

Baseline: 1cd59eb
Comparison: 5d683fb
Diff

Optimization Goals: ✅ Improvement(s) detected

perf	experiment	goal	Δ mean %	Δ mean % CI	trials	links
✅	file_to_blackhole_1000ms_latency	egress throughput	+48.20	[+47.42, +48.99]	1	Logs

Fine details of change detection per experiment

perf	experiment	goal	Δ mean %	Δ mean % CI	trials	links
✅	file_to_blackhole_1000ms_latency	egress throughput	+48.20	[+47.42, +48.99]	1	Logs
➖	file_to_blackhole_500ms_latency	egress throughput	+1.07	[+0.27, +1.87]	1	Logs
➖	quality_gate_idle_all_features	memory utilization	+0.59	[+0.50, +0.67]	1	Logs bounds checks dashboard
➖	tcp_syslog_to_blackhole	ingress throughput	+0.36	[+0.30, +0.42]	1	Logs
➖	file_tree	memory utilization	+0.36	[+0.23, +0.49]	1	Logs
➖	uds_dogstatsd_to_api_cpu	% cpu utilization	+0.24	[-0.43, +0.91]	1	Logs
➖	file_to_blackhole_300ms_latency	egress throughput	+0.09	[-0.64, +0.81]	1	Logs
➖	file_to_blackhole_1000ms_latency_linear_load	egress throughput	+0.08	[-0.37, +0.53]	1	Logs
➖	file_to_blackhole_0ms_latency_http1	egress throughput	+0.01	[-0.87, +0.89]	1	Logs
➖	file_to_blackhole_0ms_latency_http2	egress throughput	+0.01	[-0.87, +0.88]	1	Logs
➖	tcp_dd_logs_filter_exclude	ingress throughput	+0.00	[-0.01, +0.02]	1	Logs
➖	uds_dogstatsd_to_api	ingress throughput	-0.01	[-0.13, +0.12]	1	Logs
➖	file_to_blackhole_0ms_latency	egress throughput	-0.03	[-0.92, +0.86]	1	Logs
➖	file_to_blackhole_100ms_latency	egress throughput	-0.05	[-0.85, +0.75]	1	Logs
➖	quality_gate_idle	memory utilization	-0.07	[-0.11, -0.03]	1	Logs bounds checks dashboard
➖	quality_gate_logs	% cpu utilization	-2.06	[-5.25, +1.13]	1	Logs

Bounds Checks: ✅ Passed

perf	experiment	bounds_check_name	replicates_passed	links
✅	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	memory_usage	10/10	bounds checks dashboard
✅	quality_gate_idle_all_features	memory_usage	10/10	bounds checks dashboard
✅	quality_gate_logs	lost_bytes	10/10
✅	quality_gate_logs	memory_usage	10/10

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_idle, bounds check memory_usage: 10/10 replicas passed. Gate passed.
• quality_gate_idle_all_features, bounds check memory_usage: 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.