2.9.0

Added log target support to ops.pebble layers and plans.
Added Harness.run_action(), testing.ActionOutput, and testing.ActionFailed

2.8.0

Added Unit.reboot() and `Harness.reboot_count``
Added RelationMeta.optional
The type of a Handle's key was expanded from str to str|None
Narrowed types of app and unit in relation events to exclude None where applicable

2.7.0

Added Unit.set_ports()
Type checks now allow comparing a JujuVersion to a str
Renamed OpenPort to Port (OpenPort remains as an alias)