chore: Migrate to .NET 6.0

[tomkerkhove]

Migrate to .NET 6.0

• Migrate to .NET 6.0
• Run & post performance test comparison
• Update changelog
  • Difference in Docker image size
  • Improvements such as startup trace

Closes #1339

[tomkerkhove]

As part of the migration, I ran a few performance benchmarks.

Scraping metrics on Scraper agent

In this scenario, we automatically send a growing number of requests (5 to 25) to scrape metrics over 60 seconds.

Source

Measurements

Runtime	Test Run	Total Requests	Total Failures	Latency - Min	Latency - Max	Latency - Median	Latency - P95	Latency - P99	Requests/second
.NET 3.1	Test Run #1	680	100 (14.7%)	1610 ms	9941 ms	4231.1 ms	9416.8 ms	9801.2 ms	10/sec
	Test Run #2	749	0	4 ms	7656 ms	1380.5 ms	7117 ms	7407.5 ms	13/sec
	Test Run #3	707	0	4 ms	6165 ms	1525.7 ms	4492.8 ms	5711.5 ms	14/sec
.NET 6.0	Test Run #1	709	0 (0%)	3 ms	2790 ms	82.3 ms	2465.6 ms	2671 ms	12/sec
	Test Run #2	710	1 (0.14%)	3 ms	3833 ms	16 ms	2186.8 ms	3072.4 ms	13/sec
	Test Run #3	738	2 (0.27%)	3 ms	4765 ms	22 ms	3328.3 ms	3678.4 ms	14/sec

Probing health endpoint on Resource Discovery agent

In this scenario, we automatically send a growing number of requests (5 to 25) to probe the health endpoint over 60 seconds.

Source

Measurements

Runtime	Total Requests	Total Failures	Latency - Min	Latency - Max	Latency - Median	Latency - P95	Latency - P99	Requests/second
.NET 3.1	567	550 (97%)	1035 ms	8599 ms	1326.4 ms	8352 ms	8352 ms	8/sec
.NET 6.0	723	527 (72,9%)	431 ms	9843 ms	1274.3 ms	3328.3 ms	5711.5 ms	14/sec