Where can I find the log for the bucket activities? I want to troubleshoot on when Splunk checks bucket sizes and when it moves buckets from each state (hot to warm, warm to cold, cold to frozen).
According to the "Index activity" view in Splunk's search app (v4.x), bucket related messages are in splunkd.log, tagged with databasepartitionPolicy or HotDBManager.
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You may wish to increase the logging level: http://www.splunk.com/base/Documentation/4.0.10/Admin/Splunklogfiles#debug