If you are looking to get rid of those messages altogether, you could use props / transforms to get rid of those events at index time...
#props.conf
[sourcetype-of-annoying-event]
TRANSFORMS-get_rid_of_annoying_messages = shred_useless_cim_events
#transforms.conf
[shred_useless_cim_events]
SOURCE_KEY = _raw
DEST_KEY = queue
FORMAT = nullQueue
REGEX = Splunk_SA_CIM\sversion\s4\.11\.0\sis\slower\sthan\srequired\s4\.9\.1
... These would need to be put on your indexers and / or heavy forwarders, depending on how data is coming into Splunk.
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