## About the changes
Adds optional support for specifying JSON templates for datadog message
payload
![image](https://github.com/Unleash/unleash/assets/707867/eb7c838a-7abf-441e-972e-ddd7ada07efa)
### Important files
<!-- PRs can contain a lot of changes, but not all changes are equally
important. Where should a reviewer start looking to get an overview of
the changes? Are any files particularly important? -->
`frontend/src/component/integrations/IntegrationForm/IntegrationParameters/IntegrationParameter/IntegrationParameterEnableWithDropdown.tsx`
- a new component comprising of a text field and a dropdown menu
`src/lib/addons/datadog.ts` - Where the integration is taking place
## Discussion points
<!-- Anything about the PR you'd like to discuss before it gets merged?
Got any questions or doubts? -->
- Should I have implemented the new component type as a specifiable
addon parameter type in definitions? Felt a bit YAGNI/Premature
- Would like input on naming and the new component etc
This PR adds potentially stale events as available to all addons and
adds a formatted message.
## Discussion
I'd still be interested in hearing input on whether the event type
should be selectable by addons or not before we start emitting the
event. I'm leaning towards "yes", but I'll take your thoughts into
consideration.
## About the changes
Include a new configuration parameter to be able to specify
source_type_name. This is an opt-in feature which provides backward
compatibility to our existing users.
![image](https://github.com/Unleash/unleash/assets/455064/0e65584f-f601-4f17-b7a5-e73dae55772e)
Closes#4109
## Discussion points
Maybe this should be hardcoded to `Unleash` but this gives additional
flexibility
###What
Adds an optional sensitive parameter for customHeaders to all current
addons. It is sensitive because the user might be including api key headers.
* feat: add new more specific feature/environment events to addons
* Updated strategy change text
* Update all three addon messages for strategy
* Link to new features view for strategy change text
Co-authored-by: Ivar Conradi Østhus <ivarconr@gmail.com>