How to create new multivalued field based on multivalued field

[karlduncans]

I'm trying to create a new field that can populate multiple values based on another field's values. in this case i have a field called host, where there are 20 virtual servers listed. but, i want to separate them out by say, their "location" based on the host name alone.

for example:
new field hostLocation

host1, host2, host3, host4, host5, =northServers
host6, host7, host8, host9, host10, =southServers
host11, host12, host13, host14, host15, = westServers
host16, host17, host18, host19, host20, =eastServers

So if i were to run

index=foo source=bar
| stats count by hostLocation

would return log counts for the four defined host locations. ive tried various types of eval statements, but this case has more that just 2 outcomes.

thank you in advance!

[emiller42 · Accepted solution]

| eval hostLocation=case(host=="host1" OR host=="host2" OR host=="host3", "northServers",
    host=="host6" OR host=="host7" OR host=="host8", "southServers",
    host=="host11" OR host=="host12" OR host=="host13", "westServers")

I left out some data just because the above illustrates the methodology. You are not limited to two cases when using the case() eval function.

Another option is to tag your hosts with this metadata. Then you can just use the tag for filtering/aggregation.