Need help - Grafana agent flow - Set label based on filepath

[DamienCH]

Hello folks,

I need to figure how to dynamically assign labels based on the filepath where logs are collected.
Logs will be collected from a bunch of subfolders under "logspath":
C:\folder01\logspath\customer01\app01\somelog.log
I have to assign a "customer" and a "app" label with the values extracted from the path.

This is done using Grafana Agent Flow (latest version).

I found someone who was able to achieve that, but their config file syntax doesn't look at all like what I see in the documentation.

Your help would be greatly appreciated.

Code block I came up with (but doesn't work at all):

`loki.relabel "fixed_labels" {
forward_to = [loki.process.fields_to_label.receiver]

rule {
    action = "replace"
    target_label = "customer"
    source_labels = ["__path__"]
    regex = "c:\\folder01\\logspath\\(?P<customer>.*)\\.*\\.*"
}

`

1. Is that even the right process ? Relabel ?
2. is that the right flow ? (regex runs against the source_labels, selects the named group "customer" and that value "replaces" the target label "customer".) Or do I get all that wrong?
3. Even the regex is difficult to work with (works fine in regex101, but not in the agent config). Do you see what's wrong with it ?

Any help would be greatly appreciated.

[DamienCH]

Ok this can be dismissed, I found the solution.

This is a sample of the config that worked for me:
_loki.relabel "dynamic_labels" {
forward_to = [loki.relabel.fixed_labels.receiver]

rule {
    action          = "replace"
    source_labels   = ["filename"]
    target_label    = "customer"
    regex           = `c:\\ems\\logspath\\(?P<customer>.*)\\.*\\.*`
    replacement     = "$1"
}
rule {
    action          = "replace"
    source_labels   = ["filename"]
    target_label    = "app"
    regex           = `c:\\ems\\logspath\\.*\\(?P<app>.*)\\.*`
    replacement     = "$1"
}_

Leaving this here, cause I've found I wasn't the only one struggling with that. Hopefully that helps someone.