[indexer1] The lookup table 'BlogArticleMonthLookup' does not exist. It is referenced by configuration 'apache_req_blogs'.
[indexer1] The lookup table 'IPAMLookup' does not exist. It is referenced by configuration '(?::){0}PerfmonMk*:*'.
How to fix it?
You have an app / search configured that is using a lookup table that isnt on your indexer[s].
Two possible options-
1) Distribute the app to your indexer[s] that this lookup is contained in. Install that app on the indexers in $splunk_home$/etc/apps
2) Change the searches that are giving you this error to ... | lookup local=true ....
On a side note, depending on what the search does, changing it to a local lookup may result in search results not being properly populated. E.g., some fields may not get properly created or additional fields may not be created.
Check if the automatic lookups defined in Settings -> Lookups -> Automatic Lookups reference existing lookup definitions, and that those definitions reference existing lookup files.
if you want to see your all lookup file go to :--->> ($SPLUNK_HOME/etc/system/lookups or $SPLUNK_HOME/etc/apps/*/lookups).
outputlookup
Save search results to specified static lookup table.
Examples
Write to "usertogroup" lookup table (as specified in transforms.conf).
| outputlookup usertogroup
Write to "users.csv" lookup file (under $SPLUNK_HOME/etc/system/lookups or $SPLUNK_HOME/etc/apps/*/lookups).
| outputlookup users.csv