Add sns notification support back about alertmanager

[crhuber]

Is anyone working on this? I think this is a pretty key feature to have

[Vince-Cercury]

@stuartnelson3 do you know an example on how to configure webhook with SNS?

[b3tyar]

I have made a simple workaround, if anyone is interested.
It was my hello world in Go, so don't judge too hard.

https://github.com/b3tyar/snsgateway

[juliusv]

/cc @GiantToast This nil-pointer crash probably got introduced due to this upstream change in the Go AWS library: aws/aws-sdk-go@1a69d06. Would you be up for looking into it since you added the SNS support?

[GiantToast]

Sorry just seeing this. After a quick glance at that Go AWS library change and the code I added, looks like a one line change. I don't have time right now to test it out, but I should be able to get that fixed tomorrow afternoon.

[juliusv]

@GiantToast Any news on this?

[GiantToast]

Went to make the needed change, and everything has changed! All that was needed was to change
sns.New(nil) to sns.New(session.New())
but it looks like the SNS stuff got lost in the rewrite.

[lhoss]

any update on this ?
we need SNS support soon in one of our prometheus deployments .

is there anything missing to make a PR with @GiantToast 's suggestion above ? ( #157 (comment) )

[stuartnelson3]

The recommendation is to create a webhook notifer, as we are not currently adding new notifiers.