# Custom metrics from bunch of servers **URL:** \ **Category:** Elasticsearch\ **Created:** [September 28, 2020, 2:32pm UTC](https://discuss.elastic.co/t/custom-metrics-from-bunch-of-servers/250209 "2020-09-28T14:32:37Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![rmrfchik](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/rmrfchik/32/76332_2.png) [@rmrfchik](https://discuss.elastic.co/u/rmrfchik)\ **Post date:** [September 28, 2020, 2:32pm UTC](https://discuss.elastic.co/t/custom-metrics-from-bunch-of-servers/250209/1 "2020-09-28T14:32:37Z")
I have a number of different servers (php, java...). All of the servers uses different user tracking cookies and are behind nginx. I already have access.log with all cookies I need and all of them are feeded to ES with logstash. Now I want to analyze logs to see metrics: unique visitors per page, unique user\_agents per page and so on. In RDMBS I would create view with complex SELECT to distinguish visitors. Not sure this is right way in ES. Should I build/calculate these metrics outside ES or there is good way to do it in ES? ---
**Author:** ![warkolm](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/warkolm/32/39224_2.png) [@warkolm](https://discuss.elastic.co/u/warkolm)\ **Post date:** [September 28, 2020, 11:22pm UTC](https://discuss.elastic.co/t/custom-metrics-from-bunch-of-servers/250209/2 "2020-09-28T23:22:13Z")
Elasticsearch aggregations should do what you want. Have a look at things like the terms aggregation. You can build all of these in Kibana as graphs too. ---
**Author:** ![rmrfchik](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/rmrfchik/32/76332_2.png) [@rmrfchik](https://discuss.elastic.co/u/rmrfchik)\ **Post date:** [September 29, 2020, 8:36am UTC](https://discuss.elastic.co/t/custom-metrics-from-bunch-of-servers/250209/3 "2020-09-29T08:36:09Z")
Seems like I didn't express all difficulties I see. Each server has different cookies to track user (PHPSESSID, JSESSSIONID, metrics and such). Many of users don't like to be tracked and has no cookies enabled. So I have access.log line with all common fields and number of cookies I intent to use to track. To distinguish visitor, I check "main" cookie, say \_ym\_id (from yandex metrica), if it not set then BX\_USER\_ID, if it not set, then PHPSESSID and lastly ip with user-agent. I'm afraid this aggregation may be difficult for ES under heavy load. Or this is normal way? ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [October 27, 2020, 8:36am UTC](https://discuss.elastic.co/t/custom-metrics-from-bunch-of-servers/250209/4 "2020-10-27T08:36:15Z")
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