[pkg-go] Bug#921739: amtool: error: comment required by config

[Santiago Vila]

Package: prometheus-alertmanager
Version: 0.15.3+ds-2

Hello again.

File /usr/share/doc/prometheus-alertmanager/README.md.gz suggests doing this:

amtool silence add alertname=Test_Alert

but this is what I get:

amtool: error: comment required by config

Trying to see what's wrong, I tried using amtool 0.16.1, downloaded
from github:

$ /tmp/amtool silence add alertname=Test_Alert
amtool: error: required flag --alertmanager.url not provided

Ok, apparently it needs the url of the current alertmanager instance,
let's try this then:

$ /tmp/amtool --alertmanager.url=http//:localhost:9093 silence add alertname=Test_Alert

Output:

amtool: error: comment required by config

So, back to square one. Is there a trick to make this work? Maybe I'm
missing something, but I don't know what it could be.

I would love to use the web UI, but it's gone:

 The Debian package of the alertmanager does not include a web
 application.

Is this a Debian-specific change? If yes, could we have the web UI back?
In my opinion, it was better than nothing.

Thanks.