chore(log_to_metric transform): Audit log_to_metric transform

[fuchsnj]

closes https://github.com/vectordotdev/vector/issues/14067

There were some minor changes to when an event is considered "dropped" with this transform. A single event can generate multiple metrics. If a single metric fails, the event is dropped and no metrics are published.

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Soak Test Results

Baseline: 7b26f65c6bde9fe824ea15948fa0147cf026db5e Comparison: d58f3dc7183205a084f98f2748656a088ffe5d83 Total Vector CPUs: 4

Explanation

A soak test is an integrated performance test for vector in a repeatable rig, with varying configuration for vector. What follows is a statistical summary of a brief vector run for each configuration across SHAs given above. The goal of these tests are to determine, quickly, if vector performance is changed and to what degree by a pull request. Where appropriate units are scaled per-core.

The table below, if present, lists those experiments that have experienced a statistically significant change in their throughput performance between baseline and comparision SHAs, with 90.0% confidence OR have been detected as newly erratic. Negative values mean that baseline is faster, positive comparison. Results that do not exhibit more than a ±8.87% change in mean throughput are discarded. An experiment is erratic if its coefficient of variation is greater than 0.3. The abbreviated table will be omitted if no interesting changes are observed.

No interesting changes in throughput with confidence ≥ 90.00% and absolute Δ mean >= ±8.87%:

Fine details of change detection per experiment.

experiment	Δ mean	Δ mean %	confidence	baseline mean	baseline stdev	baseline stderr	baseline outlier %	baseline CoV	comparison mean	comparison stdev	comparison stderr	comparison outlier %	comparison CoV	erratic	declared erratic
syslog_log2metric_splunk_hec_metrics	432.36KiB	2.57	100.00%	16.45MiB	843.12KiB	17.19KiB	0	0.0500354	16.87MiB	1.09MiB	22.71KiB	0	0.0646003	False	False
http_pipelines_blackhole_acks	24.96KiB	2.15	100.00%	1.13MiB	110.78KiB	2.26KiB	0	0.0954338	1.16MiB	83.78KiB	1.71KiB	0	0.0706492	False	False
syslog_log2metric_humio_metrics	274.43KiB	2.13	100.00%	12.57MiB	435.7KiB	8.9KiB	0	0.0338497	12.84MiB	531.5KiB	10.82KiB	0	0.0404309	False	False
syslog_humio_logs	262.87KiB	1.6	100.00%	16.01MiB	813.1KiB	16.6KiB	0	0.0495761	16.27MiB	772.86KiB	15.83KiB	0	0.0463793	False	False
splunk_hec_route_s3	223.58KiB	1.2	99.82%	18.25MiB	2.43MiB	50.65KiB	0	0.133258	18.47MiB	2.42MiB	50.71KiB	0	0.131197	False	False
syslog_splunk_hec_logs	127.1KiB	0.78	100.00%	15.93MiB	854.62KiB	17.39KiB	0	0.0523964	16.05MiB	785.67KiB	16.03KiB	0	0.0477965	False	False
http_text_to_http_json	61.17KiB	0.15	97.27%	39.24MiB	984.47KiB	20.1KiB	0	0.0244941	39.3MiB	934.77KiB	19.08KiB	0	0.0232223	False	False
syslog_regex_logs2metric_ddmetrics	12.09KiB	0.1	52.87%	12.38MiB	578.25KiB	11.78KiB	0	0.0456159	12.39MiB	587.24KiB	11.96KiB	0	0.0462815	False	False
splunk_hec_to_splunk_hec_logs_noack	13.57KiB	0.06	76.23%	23.82MiB	454.75KiB	9.28KiB	0	0.0186363	23.84MiB	332.38KiB	6.78KiB	0	0.0136138	False	False
splunk_hec_to_splunk_hec_logs_acks	9.82KiB	0.04	31.14%	23.75MiB	867.43KiB	17.64KiB	0	0.0356632	23.76MiB	835.48KiB	17.0KiB	0	0.0343354	False	False
enterprise_http_to_http	-1.21KiB	-0	12.61%	23.85MiB	263.51KiB	5.38KiB	0	0.0107892	23.84MiB	262.4KiB	5.37KiB	0	0.0107443	False	False
file_to_blackhole	-55.64KiB	-0.06	48.87%	95.34MiB	2.81MiB	58.24KiB	0	0.0294622	95.29MiB	2.96MiB	61.52KiB	0	0.0310418	False	False
splunk_hec_indexer_ack_blackhole	-16.14KiB	-0.07	46.74%	23.76MiB	858.55KiB	17.47KiB	0	0.03528	23.74MiB	937.29KiB	19.07KiB	0	0.0385414	False	False
datadog_agent_remap_blackhole	-44.91KiB	-0.07	26.34%	58.91MiB	4.84MiB	100.86KiB	0	0.0821873	58.86MiB	4.19MiB	87.46KiB	0	0.0712447	False	False
http_to_http_json	-26.97KiB	-0.11	97.78%	23.85MiB	333.27KiB	6.8KiB	0	0.0136447	23.82MiB	470.94KiB	9.63KiB	0	0.0193027	False	False
datadog_agent_remap_blackhole_acks	-83.38KiB	-0.14	58.71%	60.24MiB	4.16MiB	86.61KiB	0	0.06905	60.15MiB	2.56MiB	53.51KiB	0	0.0425021	False	False
fluent_elasticsearch	-285.29KiB	-0.35	100.00%	79.47MiB	53.45KiB	1.08KiB	0	0.000656603	79.19MiB	3.05MiB	62.65KiB	0	0.0384972	False	False
http_to_http_noack	-92.48KiB	-0.38	99.99%	23.84MiB	403.25KiB	8.24KiB	0	0.0165176	23.75MiB	1.09MiB	22.64KiB	0	0.0457212	False	False
http_pipelines_no_grok_blackhole	-53.89KiB	-0.51	98.97%	10.37MiB	109.16KiB	2.23KiB	0	0.010281	10.31MiB	1.0MiB	20.87KiB	0	0.0971372	False	False
http_to_http_acks	-114.39KiB	-0.65	38.01%	17.28MiB	7.67MiB	160.41KiB	0	0.443955	17.17MiB	7.94MiB	165.68KiB	0	0.462393	True	True
socket_to_socket_blackhole	-251.75KiB	-1.12	100.00%	21.94MiB	1.32MiB	27.67KiB	0	0.0603258	21.69MiB	1.11MiB	23.22KiB	0	0.051195	False	False
syslog_loki	-176.55KiB	-1.21	100.00%	14.23MiB	689.85KiB	14.13KiB	0	0.0473291	14.06MiB	827.12KiB	16.81KiB	0	0.0574432	False	False
datadog_agent_remap_datadog_logs	-856.78KiB	-1.38	100.00%	60.64MiB	912.56KiB	18.68KiB	0	0.0146933	59.8MiB	4.23MiB	88.04KiB	0	0.0707093	False	False
http_pipelines_blackhole	-27.42KiB	-1.7	100.00%	1.57MiB	149.06KiB	3.05KiB	0	0.09255	1.55MiB	190.58KiB	3.88KiB	0	0.120378	False	False
datadog_agent_remap_datadog_logs_acks	-1.08MiB	-1.77	100.00%	60.93MiB	4.41MiB	92.18KiB	0	0.072333	59.85MiB	5.34MiB	111.06KiB	0	0.0891247	False	False