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=== DESCRIBE FEATURES ===

# Get cluster-wide finalized features, and features supported by a specific broker.
# - Use `--bootstrap-server` to provide a broker host:port to which queries should be issued.
# - Optionally, provide `--from-controller` flag directing the tool to issuedescribe the queryfeatures to the
#   controller (while discovering only from the controller via the bootstrap server).
#   This can be useful for debugging purposes.

$> kafka-features.sh
     --describe \
     --bootstrap-server kafka-broker0.prn1:9071 \
     [--from-controller]

Feature: consumer_offsets_topic_schema  SupportedMinVersion: 1  SupportedMaxVersion: 1  FinalizedMinVersionLevel: -     FinalizedMaxVersionLevel: -     Epoch: 1
Feature: group_coordinator  SupportedMinVersion: 1  SupportedMaxVersion: 2  FinalizedMinVersionLevel: 1     FinalizedMaxVersionLevel: 1     Epoch: 1
Feature: transaction_coordinator  SupportedMinVersion: 1  SupportedMaxVersion: 5  FinalizedMinVersionLevel: 1     FinalizedMaxVersionLevel: 4     Epoch: 1

=== UPGRADE TO ALL LATEST FEATURES ===

# Upgrade to the max version levels of all features, as internally known to the CLI tool.
#
# - This command removes the burden to individually finalize feature upgrades.
#   This becomes handy to a cluster operator intending to finalize a cluster with all the latest
#   available feature version levels. This usually happens after completing the deployment
#   of a newer Kafka Broker release onto an existing cluster.
# - Use `--bootstrap-server` to provide a broker host:port to which queries should be issued.
# - Optionally, use the `--dry-run` flag to list the feature updates without applying them.

$> kafka-features.sh \
     --upgrade-all \
     --bootstrap-server kafka-broker0.prn1:9071 \
     [--dry-run]

    [Add] Feature: consumer_offsets_topic_schema       ExistingFinalizedMaxVersion: -  NewFinalizedMaxVersion: 1       Result: OK
[Upgrade] Feature: group_coordinator      ExistingFinalizedMaxVersion: 1  NewFinalizedMaxVersion: 2       Result: OK
[Upgrade] Feature: transaction_coordinator      ExistingFinalizedMaxVersion: 4  NewFinalizedMaxVersion: 5       Result: OK

=== EMERGENCY DOWNGRADE ALL FEATURES ===

# Downgrade to the max version levels of all features known to the CLI tool.
#
# - This command removes the burden to individually finalize feature version
#   downgrades. This becomes handy to a cluster operator intending to downgrade all
#   feature version levels, just prior to rolling back a Kafka Broker deployment
#   on a cluster, to a previous Broker release.
# - Optionally, use the `--dry-run` flag to list the feature updates without applying them.

$> kafka-features.sh \
     --downgrade-all \
     --bootstrap-server kafka-broker0.prn1:9071 \
     [--dry-run]

   [Delete] Feature: consumer_offsets_topic_schema       ExistingFinalizedMaxVersion: 1  NewFinalizedMaxVersion: -       Result: OK
[Downgrade] Feature: group_coordinator      ExistingFinalizedMaxVersion: 2  NewFinalizedMaxVersion: 1       Result: OK
[Downgrade] Feature: transaction_coordinator      ExistingFinalizedMaxVersion: 5  NewFinalizedMaxVersion: 4       Result: OK