chore(metric_to_log transform): Audit metric_to_log transform

[fuchsnj]

closes https://github.com/vectordotdev/vector/issues/14069

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Soak Test Results

Baseline: 9cf1ea9b08ed745e3872c1cc81757f6078c82419 Comparison: b8b3fb5c78d5e4acb7679706563cf776eca749d5 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_loki	362.9KiB	2.5	100.00%	14.18MiB	455.48KiB	9.32KiB	0	0.031373	14.53MiB	772.52KiB	15.7KiB	0	0.0519128	False	False
http_pipelines_blackhole_acks	14.72KiB	1.24	100.00%	1.16MiB	124.76KiB	2.54KiB	0	0.10544	1.17MiB	91.4KiB	1.86KiB	0	0.0763007	False	False
http_text_to_http_json	491.36KiB	1.21	100.00%	39.52MiB	764.8KiB	15.61KiB	0	0.0188941	40.0MiB	730.88KiB	14.92KiB	0	0.0178393	False	False
socket_to_socket_blackhole	244.28KiB	1.03	100.00%	23.14MiB	187.67KiB	3.83KiB	0	0.00791864	23.38MiB	131.9KiB	2.69KiB	0	0.00550886	False	False
http_to_http_acks	148.4KiB	0.85	46.43%	17.06MiB	8.22MiB	171.93KiB	0	0.481819	17.21MiB	8.0MiB	166.88KiB	0	0.464876	True	True
http_pipelines_no_grok_blackhole	50.4KiB	0.46	98.52%	10.69MiB	130.35KiB	2.66KiB	0	0.0119032	10.74MiB	1007.15KiB	20.49KiB	0	0.091547	False	False
datadog_agent_remap_datadog_logs_acks	201.45KiB	0.32	90.75%	61.03MiB	3.63MiB	75.74KiB	0	0.0594313	61.23MiB	4.46MiB	92.74KiB	0	0.0727502	False	False
syslog_regex_logs2metric_ddmetrics	38.83KiB	0.3	97.90%	12.53MiB	598.77KiB	12.2KiB	0	0.0466483	12.57MiB	568.11KiB	11.57KiB	0	0.0441263	False	False
splunk_hec_to_splunk_hec_logs_noack	15.34KiB	0.06	81.11%	23.82MiB	466.65KiB	9.52KiB	0	0.0191261	23.84MiB	330.61KiB	6.75KiB	0	0.0135419	False	False
enterprise_http_to_http	261.71B	0	2.79%	23.84MiB	252.29KiB	5.15KiB	0	0.0103304	23.84MiB	253.56KiB	5.19KiB	0	0.0103822	False	False
datadog_agent_remap_blackhole_acks	-6.76KiB	-0.01	4.34%	60.69MiB	4.64MiB	96.71KiB	0	0.0765064	60.68MiB	3.74MiB	78.26KiB	0	0.0616887	False	False
splunk_hec_to_splunk_hec_logs_acks	-6.82KiB	-0.03	22.67%	23.76MiB	805.93KiB	16.4KiB	0	0.0331156	23.75MiB	838.78KiB	17.06KiB	0	0.0344751	False	False
splunk_hec_indexer_ack_blackhole	-7.09KiB	-0.03	24.04%	23.77MiB	773.87KiB	15.75KiB	0	0.03179	23.76MiB	835.1KiB	16.99KiB	0	0.0343153	False	False
splunk_hec_route_s3	-9.88KiB	-0.05	11.86%	18.78MiB	2.29MiB	47.73KiB	0	0.121981	18.78MiB	2.19MiB	45.91KiB	0	0.116874	False	False
file_to_blackhole	-62.19KiB	-0.06	50.73%	95.34MiB	2.89MiB	59.9KiB	0	0.0303013	95.28MiB	3.27MiB	68.04KiB	0	0.0343361	False	False
http_to_http_json	-21.61KiB	-0.09	94.62%	23.85MiB	343.41KiB	7.01KiB	0	0.0140609	23.82MiB	427.7KiB	8.74KiB	0	0.0175275	False	False
fluent_elasticsearch	-141.48KiB	-0.17	100.00%	79.47MiB	52.19KiB	1.06KiB	0	0.000641137	79.33MiB	1.24MiB	25.47KiB	0	0.0156037	False	False
datadog_agent_remap_blackhole	-166.29KiB	-0.27	90.28%	59.96MiB	3.93MiB	81.81KiB	0	0.0654588	59.8MiB	2.77MiB	57.9KiB	0	0.046392	False	False
http_to_http_noack	-78.05KiB	-0.32	99.98%	23.85MiB	253.33KiB	5.18KiB	0	0.0103726	23.77MiB	984.23KiB	20.05KiB	0	0.040429	False	False
syslog_humio_logs	-58.42KiB	-0.34	100.00%	16.59MiB	117.25KiB	2.39KiB	0	0.0069003	16.53MiB	117.76KiB	2.41KiB	0	0.00695398	False	False
syslog_log2metric_humio_metrics	-45.82KiB	-0.36	99.16%	12.43MiB	541.72KiB	11.06KiB	0	0.0425365	12.39MiB	658.71KiB	13.42KiB	0	0.0519098	False	False
datadog_agent_remap_datadog_logs	-231.11KiB	-0.36	99.29%	62.26MiB	560.47KiB	11.47KiB	0	0.00878927	62.03MiB	4.08MiB	85.03KiB	0	0.0657932	False	False
http_pipelines_blackhole	-8.04KiB	-0.46	99.96%	1.7MiB	22.55KiB	471.99B	0	0.012948	1.69MiB	108.0KiB	2.2KiB	0	0.0622954	False	False
syslog_log2metric_splunk_hec_metrics	-151.03KiB	-0.84	100.00%	17.51MiB	547.92KiB	11.17KiB	0	0.0305462	17.37MiB	764.7KiB	15.56KiB	0	0.0429939	False	False
syslog_splunk_hec_logs	-357.61KiB	-2.29	100.00%	15.26MiB	1.58MiB	32.83KiB	0	0.103267	14.91MiB	1.67MiB	34.77KiB	0	0.111747	False	False