add guiding policy for contribex review on test-infra repo

sig-contributor-experience/contribex-review-guidelines-on-test-infra.md

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+# Guiding policy for test-infra changes requiring review by SIG Contributor Experience
+
+This document serves as a guiding policy to help identify which changes in the `git.k8s.io/test-infra/` repository require a review from the Technical Leads of SIG Contributor Experience.
+
+It also outlines areas that are outside the scope of SIG Contributor Experience's review.
+
+Note: This document is not a binding or an exhaustive list, but aims to provide general guidance.
+
+---
+
+## Index
+
+1. [When a Review from SIG Contributor Experience is Required](#when-a-review-from-sig-contributor-experience-is-required)
+2. [Recommended Areas for ContribEx Review](#recommended-areas-for-contribex-review)
+    1. [Changes to `config/plugins.yaml`](#changes-to-configpluginsyaml)
+        - [Plugins under ContribEx Review](#plugins-under-contribex-review)
+        - [Plugins Configured for Specific Orgs/Repos](#plugins-configured-for-specific-orgsrepos)
+        - [External Plugins Configured for Specific Orgs/Repos](#external-plugins-configured-for-specific-orgsrepos)
+    2. [Changes to `config/config.yaml`](#changes-to-configconfigyaml)
+    3. [Changes to `config/prow/OWNERS` File](#changes-to-configprowowners-file)
+    4. [Changes to Prow CI Jobs and Their OWNERS Files](#changes-to-prow-ci-jobs-and-their-owners-files)
+    5. [Changes to `Label_sync` Path](#changes-to-label_sync-path)
+3. [Out of Scope](#out-of-scope)
+
+---
+
+## When a Review from SIG Contributor Experience is Required
+
+A review from SIG Contributor Experience is necessary if any changes introduced by a pull request to the test-infra repo:
+
+- Introduce changes to how humans interact with Prow and its components (changes that alter contributor user experience)
+- Introduce changes to how bot interact with Prow? (TODO: verify!)
+- Introduce changes to how Prow interacts with GitHub, or what information it broadcasts back to GitHub (in form of comments, etc, for example)
+- Alter the contribution workflows for project contributors.
+
+Examples include – adding new labels like `kind/foo` enabled/required by default, or changes that modify the issue/PR triage workflow used by project maintainers.
+
+---
+
+## Recommended Areas for ContribEx Review
+
+### Changes to [`config/prow/plugins.yaml`](https://github.com/kubernetes/test-infra/blob/52fb24b56def58e3cc36b10802aa6dea230584a7/config/prow/plugins.yaml)
+
+#### Plugins under ContribEx Review
+
+Following plugins fall under ContribEx review:
+
+- trigger
+- owners
+- approve
+- help
+- size
+- label
+- blockades
+- slack
+- welcome
+- require_matching_label
+
+#### Plugins Configured for Specific Orgs/Repos
+
+**Organizations:**
+- kubernetes
+- kubernetes-client
+- kubernetes-sigs
+- etcd-io
+
+**Repositories:**
+- kubernetes/kubernetes
+- kubernetes/community
+- kubernetes/org
+- kubernetes/publishing-bot
+- kubernetes-sigs/contributor-playground
+
+#### External Plugins Configured for Specific Orgs/Repos
+
+**Organizations:**
+- kubernetes
+- kubernetes-sigs
+- kubernetes-csi
+- kubernetes-client
+
+---
+
+### Changes to [`config/prow/config.yaml`](https://github.com/kubernetes/test-infra/blob/52fb24b56def58e3cc36b10802aa6dea230584a7/config/prow/config.yaml)
+
+- [slack_reporter_configs](https://github.com/kubernetes/test-infra/blob/52fb24b56def58e3cc36b10802aa6dea230584a7/config/prow/config.yaml#L215-L226)
+- [branch-protection](https://github.com/kubernetes/test-infra/blob/52fb24b56def58e3cc36b10802aa6dea230584a7/config/prow/config.yaml#L228-L636)
+- [tide](https://github.com/kubernetes/test-infra/blob/master/config/prow/config.yaml#L638-L844)
+- [github_reporter](https://github.com/kubernetes/test-infra/blob/52fb24b56def58e3cc36b10802aa6dea230584a7/config/prow/config.yaml#L850-L853)
+
+---
+
+### Changes to [`config/prow/OWNERS`](https://github.com/kubernetes/test-infra/blob/52fb24b56def58e3cc36b10802aa6dea230584a7/config/prow/OWNERS#L1) file
+
+Any changes to the reviewers/approvers or filters listed in the `config/prow/OWNERS` file.
+
+---
+
+### Changes to Prow CI Jobs and Their OWNERS Files
+
+Changes to the definition of the following Prow CI jobs files as well as their respective OWNERS files, owned directly or indirectly by SIG ContribEx:
+
+- All files under [kubernetes/community/](https://github.com/kubernetes/test-infra/tree/master/config/jobs/kubernetes/community) path
+- All files under [kubernetes/org/](https://github.com/kubernetes/test-infra/tree/master/config/jobs/kubernetes/org) path
+- [kubernetes/sig-k8s-infra/trusted/sig-contribex-k8s-triage-robot.yaml](https://github.com/kubernetes/test-infra/blob/master/config/jobs/kubernetes/sig-k8s-infra/trusted/sig-contribex-k8s-triage-robot.yaml)
+- [kubernetes/sig-k8s-infra/trusted/sig-contribex-peribolos.yaml](https://github.com/kubernetes/test-infra/blob/master/config/jobs/kubernetes/sig-k8s-infra/trusted/sig-contribex-peribolos.yaml)
+- [kubernetes/sig-k8s-infra/trusted/sig-k8s-infra-groups.yaml](https://github.com/kubernetes/test-infra/blob/master/config/jobs/kubernetes/sig-k8s-infra/trusted/sig-k8s-infra-groups.yaml)
+- [config/jobs/kubernetes-sigs/slack-infra/slack-infra-config.yaml](https://github.com/kubernetes/test-infra/blob/master/config/jobs/kubernetes-sigs/slack-infra/slack-infra-config.yaml)
+
+---
+
+### Changes to `Label_sync` Path
+
+Any changes to the files under [`label_sync`](https://github.com/kubernetes/test-infra/tree/master/label_sync) path.
+
+---
+
+## Out of Scope
+
+The following are outside the scope of review by SIG Contributor Experience:
+
+- Technical changes to the source codebase of Prow components (e.g., `prow/`, now moved to `sigs.k8s.io/prow`, `kubetest`, `kettle`, etc.).
+- Technical changes to External plugins