network peer the monitoring subnets in gprd/gstg/ops
For alertmanager clustering it is desired that we network peer the monitoring subnets. This will cover both prometheus and alertmanager.
Note that internal dns resolution will not work across projects so if we do configure cross project connections it will need to be by the private ip address.
For more context see https://dev.gitlab.org/cookbooks/chef-repo/merge_requests/2531#note_134273
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Peer gstg and gprd (see how this was done for the ops network) -
Create firewall rules that allow alertmanagers to communicate with each other
Edited by Ahmad Sherif