docs: add MCP observability guidance #2800

Job	Run time
checks / pre-commit	47s
checks / readme-snippets	11s
checks / test (3.12, locked, ubuntu-latest)	1m 1s
checks / test (3.10, locked, ubuntu-latest)	58s
checks / test (3.12, lowest-direct, windows-latest)	1m 31s
checks / test (3.10, locked, windows-latest)	1m 38s
checks / test (3.11, lowest-direct, windows-latest)	1m 42s
checks / test (3.12, lowest-direct, ubuntu-latest)	1m 4s
checks / test (3.11, locked, windows-latest)	1m 15s
checks / test (3.11, locked, ubuntu-latest)	54s
checks / test (3.11, lowest-direct, ubuntu-latest)	1m 3s
checks / test (3.12, locked, windows-latest)	1m 27s
checks / test (3.10, lowest-direct, windows-latest)	1m 37s
checks / test (3.10, lowest-direct, ubuntu-latest)	1m 1s
checks / test (3.14, locked, ubuntu-latest)	2m 2s
checks / test (3.13, lowest-direct, ubuntu-latest)	1m 0s
checks / test (3.14, lowest-direct, windows-latest)	1m 18s
checks / test (3.13, locked, windows-latest)	1m 21s
checks / test (3.13, locked, ubuntu-latest)	55s
checks / test (3.14, locked, windows-latest)	2m 15s
checks / test (3.13, lowest-direct, windows-latest)	1m 27s
checks / test (3.14, lowest-direct, ubuntu-latest)	59s
all-green	2s
	27m 28s

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