This will also have the benefit of getting fresh metadata only once per transition for a given resource agent. Currently, the agent meta-data command is invoked for every resource start, even if multiple resources share the same agent.

This would be worth backporting to 2.1 if easy

As an example, for PCMK_panic_action, this will involve creating an enum for the value, which will minimize the work that panic_local() has to do. (The "sync" portion of it should likely be a flag or bool separate from the enum.)