| Elektra 0.11.0

Use Case: Notify plugins when data in the KDB changes

# Summary

- Title: Notify plugins when data in the KDB changes
- Scope: Configuration/Logging
- Level: Developer goal
- Actors: Plugin developer
- Brief: Some plugins are only executed when something changed in the KDB and as an input receive the keys that changed in their old and new state.

# Scenarios

- Precondition:
  - Something in the KDB changed
  - A plugin listening to such a hook is enabled
- Main success scenario: After a change in the KDB the plugin(s) listening on the hooks are notified
- Alternative scenario: -
- Error scenario: -
- Postcondition: -
- Non-functional Constraints:
  - Determining which plugin(s) listen on this hook should not noticably slow down Elektra