Cherry-pick #11247 to 7.0: Don't collect empty ip addresses in docker container metricset #11293
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Cherry-pick of PR #11247 to 7.0 branch. Original message:
Docker containers can have empty ip addresses if they are running in
host network mode or if they are stopped. Collecting lists with empty
addresses can make type mapping to fail when trying to store them as ip
addresses.
It only affects 7.0 because before these ip addresses were of type
keyword
.Fix #11225