segment prometheus - does not allow other labels or labels are not documented

[Nachtfalkeaw]

Hello,

error:

[root@u999fmlab001l alloy]# ./flowpipeline-linux-static -c config.yml -l "info"
2025/04/07 11:30:07 [info] Goflow: Scheme sflow supported.
2025/04/07 11:30:07 [info] Goflow: Scheme netflow supported.
2025/04/07 11:30:07 [info] Goflow: Configured for for sflow://:6343,netflow://:2055
2025/04/07 11:30:07 [info] Goflow: 'workers' set to default '1'.
2025/04/07 11:30:07 [error] Prometheus: Field 'src_addr' specified in 'labels' does not exist.
2025/04/07 11:30:07 [error] Configured segment 'prometheus' could not be initialized properly, see previous messages.
[root@u999fmlab001l alloy]#

Config:

- segment: goflow
- segment: prometheus
  config:
    endpoint: ":8888"
    labels: "src_addr"
    metricspath: "/metrics"
    flowdatapath: "/flowdata"

I do not see which labels are allowed but found this and it does not seem to work.
https://github.com/BelWue/flowpipeline/blob/master/segments/export/prometheus/prometheus.go

// Collects and serves statistics about flows.
// Configuration options for this segments are:
// The endoint field can be configured:
// <host>:8080/flowdata
// <host>:8080/metrics
// The labels to be exported can be set in the configuration.
// Default labels are:
//
//	router,ipversion,application,protoname,direction,peer,remoteas,remotecountry
//
// Additional Labels are:
//
//	src_port,dst_port,src_ip,dst_ip
//
// The additional label should be used with care, because of infite quantity.

Only the following default labels which are different than in the previous link are working:
https://github.com/BelWue/flowpipeline/blob/master/CONFIGURATION.md#prometheus

[ynHuber]

Hello @Nachtfalkeaw,

all fields defined in the ProtoBuf format are allowed. But not all will be filled. What fields are actually available depends on the input source.
A "list" can be found at

flowpipeline/pb/enrichedflow.pb.go

Line 369 in b01e7fa

type EnrichedFlow struct {

Thank you for the remark about the outdated documentation. That's something we have to update!