Limit collectds memory usage

to guard nodes from running out of memory.

If there is a connection issue with collectd not being able to
write to event or metrics endpoints, this can lead to accumulating
to large portions of memory. Limiting the memory usage via podman
memory will prevent the container to grow limitless. In case of
using more than 512 MB, podman will restart the container.

Change-Id: I0b65b2c7878fe5ebd0d7f1a6f2ba8df23f2f0b28

deployment/metrics/collectd-container-puppet.yaml

@@ -684,6 +684,7 @@ outputs:
             pid: host
             user: root
             restart: always
+            mem_limit: 512m
             cap_add:
               - IPC_LOCK
             healthcheck: