Improve remark on UDP/TCP for high availability (#2231)

* Improve remark on UDP/TCP for high availability
Signed-off-by: Pascal Hofmann <mail+github@pascalhofmann.de>

* Update README.md

Co-Authored-By: Max Inden <mail@max-inden.de>
Signed-off-by: Pascal Hofmann <mail+github@pascalhofmann.de>

* Update README.md
Signed-off-by: Pascal Hofmann <mail+github@pascalhofmann.de>

Co-authored-by: Max Inden <mail@max-inden.de>
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Pascal Hofmann 2020-05-14 16:17:03 +02:00 committed by GitHub
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@ -331,6 +331,8 @@ $ amtool config routes test --config.file=doc/examples/simple.yml --tree --verif
Alertmanager's high availability is in production use at many companies and is enabled by default.
> Important: Both UDP and TCP are needed in alertmanager 0.15 and higher for the cluster to work.
> - If you are using a firewall, make sure to whitelist the clustering port for both protocols.
> - If you are running in a container, make sure to expose the clustering port for both protocols.
To create a highly available cluster of the Alertmanager the instances need to
be configured to communicate with each other. This is configured using the