- [Server binaries](#server-binaries-7)
    - [Node binaries](#node-binaries-7)
  - [Changelog since v1.17.8](#changelog-since-v1178)
  - [Urgent Upgrade Notes](#urgent-upgrade-notes)
    - [(No, really, you MUST read this before you upgrade)](#no-really-you-must-read-this-before-you-upgrade)
  - [Changes by Kind](#changes-by-kind-8)
    - [Bug or Regression](#bug-or-regression-7)
  - [Dependencies](#dependencies-8)
    - [Added](#added-8)

   [Gradle plugin][japicmp_gradle] to enforce binary compatibility.

 * **Java source compatibility** is the ability to upgrade Java uses of OkHttp 3.x to 4.x without
   changing `.java` files.

 * **Kotlin source compatibility** is the ability to upgrade Kotlin uses of OkHttp 3.x to 4.x
   without changing `.kt` files.

With a few small exceptions (below), OkHttp 4.x is both binary- and Java source-compatible with

- For installations using Systemd MinIO service, upgrade via RPM/DEB packages **parallelly** on all servers or replace the binary lets say `/opt/bin/minio` on all nodes, apply executable permissions `chmod +x /opt/bin/minio` and process to perform `mc admin service restart alias/`.

### Upgrade Checklist

- Test all upgrades in a lower environment (DEV, QA, UAT) before applying to production. Performing blind upgrades in production environments carries significant risk.

## Changelog since v1.28.0

## Urgent Upgrade Notes 

### (No, really, you MUST read this before you upgrade)

success.upload_elevate_word=Uploaded Additional Word file.
success.upload_bad_word=Uploaded Bad Word file.
success.upload_mapping_file=Uploaded Mapping file.
success.send_testmail=Sent the test mail.
success.job_log_delete_all=Deleted job logs.
success.changed_password=Changed your password.
success.bulk_process_started=Bulk process is started.

success.crud_create_crud_table=Created data.
success.crud_update_crud_table=Updated data.

    coders call this and we don't want their users to suffer.


## Version 4.0.0

_2019-06-26_

**This release upgrades OkHttp to Kotlin.** We tried our best to make fast and safe to upgrade
from OkHttp 3.x. We wrote an [upgrade guide][upgrading_to_okhttp_4] to help with the migration and a
[blog post][okhttp4_blog_post] to explain it.

 *  Fix: Target Java 8 bytecode for Java and Kotlin.

success.upload_stopwords_file=Uploaded Stopwords file.
success.upload_stemmeroverride_file=Uploaded Stemmer Override file.
success.upload_kuromoji_file=Uploaded Kuromoji file.
success.upload_elevate_word=Uploaded Additional Word file.
success.upload_bad_word=Uploaded Bad Word file.
success.upload_mapping_file=Uploaded Mapping file.
success.send_testmail=Sent the test mail.
success.job_log_delete_all=Deleted job logs.

success.upload_stopwords_file=Uploaded Stopwords file.
success.upload_stemmeroverride_file=Uploaded Stemmer Override file.
success.upload_kuromoji_file=Uploaded Kuromoji file.
success.upload_elevate_word=Uploaded Additional Word file.
success.upload_bad_word=Uploaded Bad Word file.
success.upload_mapping_file=Uploaded Mapping file.
success.send_testmail=Sent the test mail.
success.job_log_delete_all=Deleted job logs.

    - [Node Binaries](#node-binaries-15)
    - [Container Images](#container-images-15)
  - [Changelog since v1.27.0](#changelog-since-v1270)
  - [Urgent Upgrade Notes](#urgent-upgrade-notes)
    - [(No, really, you MUST read this before you upgrade)](#no-really-you-must-read-this-before-you-upgrade)
  - [Changes by Kind](#changes-by-kind-15)
    - [Deprecation](#deprecation)
    - [API Change](#api-change-4)
    - [Feature](#feature-12)

* Implemented `kubeadm upgrade plan` for checking whether you can upgrade your cluster to a newer version ([#48899](https://github.com/kubernetes/kubernetes/pull/48899), [@luxas](https://github.com/luxas))
    * Implemented `kubeadm upgrade apply` for upgrading your cluster from one version to an other