0.12.0

• #2135 Require client certificates by default if user supplies downstream trust
• #2140 Bump Jackson from 2.18.1 to 2.18.3
• #2115 Ensure request path chains deferred opaque requests correctly
• #2113 Ensure that filter handler does not leak deferred opaque requests/responses if the upstream or downstream side closes unexpectedly
• #2098 Bump io.netty:netty-bom from 4.1.119.Final to 4.1.121.Final
• #1928 Bump info.picocli:picocli from 4.7.6 to 4.7.7
• #1437 Remove "zero-ack produce requests" warning
• #1900 Enforce business rule that a proxy must have at least one virtual cluster
• #1855 Upgrade to Apache Kafka 4.0
• #1928 Make Kroxylicious Operator metrics available for collection

Changes, deprecations and removals

• The default behaviour for client authentication has changed, if a Gateway is configured with client trust certificates, then
  by default we will require the client to supply certificates. Previously the user had to also configure the clientAuth mode to
  REQUIRED to enable this behaviour, the default was to not check the client certificates.