My splunk indexer version is 4.2.1, running on Cent0S 5.6. The four "CPU by Host" graphs used to show graphs for every host. However, they have been showing the graphs only for the "OTHER" and not for any other specific host. It seems weird to me. Where can I start my troubleshooting? Thanks.
Problem was SOLVED by restarting the indexer. It might be a software bug.
What are the values for Host? Do a search for the top hosts.