Hosted Instances know their own URL
Your hosted instance now knows its own URL. The FF_INSTANCE_URL environment variable is automatically available to your flows, so you can reference the instance's address without hardcoding it.

For Hosted Instances with a Custom Hostname that will be returned rather than the default Instance hostname.
Existing instances will need to be restarted to pick up the new Environment Variable.
This will be available to Self Hosted users from v2.29.0
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