hi there!
may i know how many users can use kibana?
what is recommended user limit for kibana?
i am using kibana v5.5.2 and free one.
There are no inbuilt limits to this.
Ultimately it depends on how well your Elasticsearch cluster supports it.
may i know how i can check my Elasticsearch cluster support well ??
You need to test that based on your data type and expected users behaviour.