Ability to add custom HTTP headers to healthprobes

[kchilka-msft]

Is your feature request related to a problem? Please describe. The current healthprobe generates lot of metrics/logs in our service. It would be nice to be able to add a header to these healthprobes so we know these are coming from gateway-probes. I tried playing with Rewrite HTTP headers but it only works if a request first lands in application gateway and doesn't work for healthprobes.

Describe the solution you'd like Ability to specify custom header in healthprobe

[theOrakle]

Or if some off the shelf software requires a header for a health check. Seems silly for the software, but we still need the gateway in front of it.