Document Endpoint `reliability` metadata #8119

Job	Run time
Unit tests on ubuntu-latest	19m 14s
Unit tests on windows-latest	28m 10s
Typos Check	3s
Lints and doc tests on ubuntu-latest	39s
Unit tests on macos-13	12m 54s
Lints and doc tests on windows-latest	3m 38s
Lints and doc tests on macos-13	1m 37s
Unit tests on macos-14	10m 25s
Lints and doc tests on macos-14	44s
Memory leak checks	0s
CI status checks	1s
	1h 17m 25s

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