I have some domain like this: domain | A | B | C | D | ...... One domain can be called in one request, now I want to know what is the average request number per minute for a domain (no matter what domain is). So I split it into three steps: 1) get the total request number per minute 2) get the number of domains been called per minute 3) avg = total request number per minute / number of domain per minute I have got the result of the first step by: ``` index="whatever" source="sourceurl" | bin _time span=1m | stats count as requestsPerMin by _time ``` However, I don't know how to get the number of domains that been called. For example, in a minute, domain A has been called twice, domain B has been called once, so the number of domains that been called should be two. But I don't know which query can get this result. I appreciate it if someone can help, sorry if it is duplicated.   ... View more