Document templating language about cloudprober

[cool-RR]

Reading the code now, I see it's Go templates. This is probably obvious for Go programmers, but it should be noted in the readme or docs. (I never worked with the Go template language before.)

[manugarg]

@cool-RR Thanks for filing this. Most folks are not even aware of the templating capabilities of cloudprober configs.

Here is some documentation on available config macros in cloudprober (with examples):
https://pkg.go.dev/github.com/google/cloudprober/config

(Can you please use 'enhancement' label for documentation issues in future. We reserve 'bug' label for functionality bugs -- bugs that folks using cloudprober should be aware of.)

[cool-RR]

Thank you! Will do.

[cool-RR]

Another thing that needs to be documented here: Which variables are automatically available to us. I know that I can use .region, but do I automatically get .zone? I have to try to find out. Would be nice if I just had a list of all the variables that are available to me.

[manugarg]

@cool-RR, Please see the announcement here: #679. Active development of this repository will move to github.com/cloudprober/cloudprober. Unfortunately, we'll have to close all the issues here, and file them again.