[Feature request] set additional labels per log entry

[yacut]

Right now, labels can only be set during client initialization. It would be very useful if you could set additional labels to individual messages. e.g.:

loki.InfoWithLabelf("{worker_id=\"123\"}", "source = %s, time = %s, i = %d\n", source_name, tstamp, i)

[afiskon]

Hi @yacut

Many thanks for the suggestion and also for the interest to the project.

Unfortunately currently I'm a little short on spare time to implement this feature, but I will be happy to merge a corresponding pull request.

[gatlee21]

Commenting in 2022 to say that this is still a relevant feature request. Thanks

[laikee99]

I just submit a pr that allow pass a parameter to change label every time.
Please check that and thank you so much.
#6