Merge pull request #7599 from pohly/linter-issues

first contribution: warn about unsolicited PRs for linter warnings

Author: k8s-ci-robot

contributors/guide/first-contribution.md

@@ -20,7 +20,7 @@ description: |
 ## Find something to work on
 
 The first step to getting starting contributing to Kubernetes is to find something
-to work on. Help is always welcome, and no contribution is too small! 
+to work on. Help is always welcome, and no contribution is too small (but see below)!
 
 Here are some things you can do today to get started contributing:
 
@@ -34,6 +34,14 @@ If the above suggestions don't appeal to you, you can browse the
 in contributing without writing code can also find ideas in the 
 [Non-Code Contributions Guide].
 
+{{< note >}}
+Although contributions are welcome, beware that every pull
+request creates work for maintainers and costs for testing it.
+Fixing *linter warnings* is often *not* worth it because the
+existing code is fine. Always discuss with maintainers first
+before creating such PRs.
+{{< /note >}}
+
 ### Find a good first topic
 
 There are [multiple repositories] within the Kubernetes organization.