- update to 1.7.0:
* [KIP-360](https://cwiki.apache.org/confluence/pages/viewpage.action?pageId=89068820) - Improve reliability of transactional producer.
Requires Apache Kafka 2.5 or later.
* OpenSSL Engine support (`ssl.engine.location`) by @adinigam and @ajbarb.
* Added `connections.max.idle.ms` to automatically close idle broker
connections.
This feature is disabled by default unless `bootstrap.servers` contains
the string `azure` in which case the default is set to <4 minutes to improve
connection reliability and circumvent limitations with the Azure load
balancers (see #3109 for more information).
* Bumped to OpenSSL 1.1.1k in binary librdkafka artifacts.
* The binary librdkafka artifacts for Alpine are now using Alpine 3.12.
OpenSSL 1.1.1k.
* Improved static librdkafka Windows builds using MinGW (@neptoess, #3130).
* The C++ `oauthbearer_token_refresh_cb()` was missing a `Handle *`
argument that has now been added. This is a breaking change but the original
function signature is considered a bug.
This change only affects C++ OAuth developers.
* [KIP-735](https://cwiki.apache.org/confluence/display/KAFKA/KIP-735%3A+Increase+default+consumer+session+timeout) The consumer `session.timeout.ms`
default was changed from 10 to 45 seconds to make consumer groups more
robust and less sensitive to temporary network and cluster issues.
* Statistics: `consumer_lag` is now using the `committed_offset`,
while the new `consumer_lag_stored` is using `stored_offset`
(offset to be committed).
This is more correct than the previous `consumer_lag` which was using
either `committed_offset` or `app_offset` (last message passed
to application).
* Bugfixes