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You can check out the Product and Technology Keynote https://conf.splunk.com/#iCpzv3oYWQiqK1jT17dsLG

splunk is great at search, its also rather good at ploting graphs for a single search.

However doing it quickly or efficiently is not splunk's strong suit.

Grafana allows you to quickly graph data from source x, compare to source y and then build a dashboard.

Splunk can also do al those things, but much slower.

We had a huge splunk clusters (100gig a day), and its a great compliment to grafana.

typically you use grafana to alert you to when things are going wrong. It would point out which system was going wrong and at what time, then you'd use splunk to get the logs to figure out the cause.

grafana is just visualizations if you self host it. Splunk is a complete product