Adding Loki as an alert source to the monitoring stack #1142
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This patch adds loki as an alert data source to the monitoring stack.
The first alert that it sends is for large cells/row/partition.
loki and promtail will be started by default, you can disable it with
--no-loki
It's possible to add loki as an independent data source, but it's not part of this series.
This patch also requires that rsyslog would send log to the monitoring from the scylla servers.
Fixes #617