The changes that I can see between 1.1.8 and 1.2.2:
most significantly (and the reason for minor version bump), adds
p75, p95, and p999 to default fields pushed for timers. Previously
it was only pushing p50, p99, and 1-minute rate.
adds support for Kafka and Log-based senders
some minor bugfixes with time handling on TCP and UDP protos
support for optional tags transformer, which supports adding tags
based on metric name
The changes that I can see between 1.1.8 and 1.2.2: