Johnny Lim

This PR changes to use `actions/checkout@v3` in `README.md`.

Add KeyValue.of() variants for none values

1

This PR adds `KeyValue.of()` variants for "none" values for convenience. See gh-3458

This PR polishes a bit. This PR also updates samples' dependency versions to the latest.

This PR changes to use `EnumMap` for `DateFormatter.ISO_PATTERNS` again by partially reverting ba136dcf40123445aa959786cdc006112d35774a as it seems to give better numbers as follows: ``` Benchmark (iso) Mode Cnt Score Error Units...

Consider documenting 3rd party integrations

2

There are a few 3rd party `MeterBinder` supports including [Apache Camel](https://github.com/micrometer-metrics/micrometer/issues/410). It would be nice to have an index page for them like [3rd party Spring Boot starters](https://github.com/spring-projects/spring-boot/tree/master/spring-boot-project/spring-boot-starters#community-contributions).

Document out-of-the-box meter descriptions

3

There's no description in the reference manual for out-of-the-box meters. We can find their descriptions in the source files and some monitoring systems like Datadog but it would be nice...

This PR simply removes an unused `import` statement which is already commented out in `LogbackValve`.

This PR updates the `OpenAiService` reference in the `README.md` file.

This PR polishes a bit.

This PR fixes a typo in the `coroutine-context-and-dispatchers.md`.