Get unique value through pattern

Grafana Loki
1

I use pattern parser for logs. For example:

| pattern '<source> - <user> [<timestamp>] "<method> <url> <type>" <status> <bytes>'

How can i get log lines only with unique label?

2

Not sure exactly what you mean, can you provide an example?

3

For example log:
192.168.0.1 - data_1
192.168.0.2 - data_2
192.168.0.1 - data_3
192.168.0.2 - data_4
192.168.0.3 - data_5
192.168.0.3 - data_6

I want to get only rows with unique IP on first match, as a result I would get
192.168.0.1 - data_1
192.168.0.2 - data_2
192.168.0.3 - data_5