2.11.0

StopEvent, RemoveEvent, and all LifeCycleEvents are no longer deferrable, and will raise a RuntimeError if defer() is called on the event object.
Added ActionEvent.id, exposing the JUJU_ACTION_UUID environment variable.

2.10.0

Added support for Pebble Notices (PebbleCustomNoticeEvent, get_notices, and so on)
Added Relation.active, and excluded inactive relations from Model.relations
Added full support for charm metadata v2 (in particular, extended ContainerMeta, and various info links in CharmMeta)

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)