* Consider replacing "transition" and "aborted" with more natural language (maybe "action plan" and "interrupted")
* Log "Calculated transition" at info level and "Transition ... Complete" at trace level when no actions are needed
* If possible, transition abort logs should say whether any already-initiated actions are still pending
* `pcmk__unpack_graph()`: "debug: Unpacked transition 0 from unknown: 0 actions in 0 synapses": lower to trace and change to "Unpacked empty transition graph"
* `abort_transition_graph()`: "Transition 0 aborted": Downgrade to trace or debug and reword
* Put scheduler execution time in "Calculated transition" message