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[docs] Add breaking changes for 7.7 (elastic#17739) (elastic#17850)
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* [docs] Add breaking changes for 7.7

* Clarify env var usage

* Fix repetition
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dedemorton authored Apr 20, 2020
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23 changes: 20 additions & 3 deletions libbeat/docs/release-notes/breaking/breaking-7.7.asciidoc
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//tag::notable-breaking-changes[]

//[float]
//==== Breaking change
[float]
==== Environment variables can no longer reference other environment variables

//Description
Environment variables are still supported in the {beats} configuration.
However, starting in Version 7.7.0, an environment variable cannot reference
another environment variable or event in the configuration.

For example, if you have `export VAR1=${VAR2}` and use `var: ${VAR1}` in
the configuration, this results in `var: "${VAR2}"`, where
`${VAR2}` is not expanded.

[float]
==== Docker and kubernetes processors no longer allowed in script processor

Prior to this release, it was possible to use the `add_docker_metadata` and
`add_kubernetes_metadata` processors in the `script` processor. This was not a
good practice because it sometimes resulted in memory and file descriptor leaks.

Starting in version 7.7.0, scripts that use these processors will fail. To
resolve this problem, define the processors in your configuration instead of the
script.

// end::notable-breaking-changes[]

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