Configuring multiple alertmanager urls in Thanos

[ajaikumarsadasivam]

We are trying to configure Thanos to send alerts to 1+ more alertmanagers.
As per the configurations: https://thanos.io/tip/components/rule.md/#flags - we tried to follow the config parameter .i.e.,
--alertmanagers.url=ALERTMANAGERS.URL ... Alertmanager replica URLs to push firing alerts. Ruler claims success if push to at least one alertmanager from discovered succeeds. The scheme should not be empty e.g http might be used. The scheme may be prefixed with 'dns+' or 'dnssrv+' to detect Alertmanager IPs through respective DNS lookups. The port defaults to 9093 or the SRV record's value. The URL path is used as a prefix for the regular Alertmanager API path.

When we configure as below:

- --alertmanagers.url=['https://abc-alertmanager.com/','https://xyz-alertmanager.com/']
- --alertmanagers.url=["https://abc-alertmanager.com/","https://xyz-alertmanager.com/"]
- --alertmanagers.url={'https://abc-alertmanager.com/','https://xyz-alertmanager.com/'}

For any of the above combinations, we get below errors:
level=error ts=2021-07-20T15:27:33.415669197Z caller=rule.go:379 msg="refreshing alertmanagers failed" err="parse URL \"[\\\"https://abc-alertmanager.com/\\\",\\\"https://xyz-alertmanager.com/\\\"]\": parse [\"https://abc-alertmanager.com/\",\"https://xyz-alertmanager.com/\"]: first path segment in URL cannot contain colon"

Please provide sample configurations on how we can configure multiple urls for the above parameter

[fktkrt]

Hey, you can specify multiple Alertmanagers by repeating the argument multiple times with different URLs as per https://github.com/thanos-io/thanos/pull/661/files

E.g. --alertmanagers.url="http://alertmanager1.domain.com:9093" --alertmanagers.url="http://alertmanager2.domain.com:9093"
It looks like it's missing from the current version of the Rule docs though.

Based on this, it's also possible by using --alertmanagers.config and --alertmanagers.config-file as well:
https://thanos.io/tip/components/rule.md/#alertmanager