Enable support for Kafka destinations

Packages describing “kafka” as local USE flag

Package “kafka” Flag Description
app-admin/syslog-ng Enable support for Kafka destinations
net-analyzer/pmacct Enable support for Apache Kafka through dev-libs/librdkafka
app-admin/rsyslog Build the Apache Kafka input/output module (requires dev-libs/librdkafka)
sys-cluster/ceph Rados Gateway's pubsub support for Kafka push endpoint

All packages providing a “kafka” USE flag (4)