Promtail vs Alloy syslog listeners

Grafana Alloy
1

I have working configuration in Promtail which processes syslog messages and forwards to loki.

The configuration snippet is like this

scrapeConfigs: |
      - job_name: syslog1
        syslog:
          listen_address: 0.0.0.0:1514
          listen_protocol: tcp
          idle_timeout: 60s
          label_structured_data: yes
          labels:
            job: syslog1
        relabel_configs:
          - source_labels: ['__syslog_message_hostname']
            target_label: 'hostname'
          - source_labels: ['__syslog_message_app_name']
            target_label: 'app_name'

It works but I have messages of length greater than 8192 it throws following error

level=warn ts=2024-12-06T18:45:36.960685886Z caller=syslogtarget.go:105 msg="error parsing syslog stream" err="message too long to parse. was size 9305, max length 8192"

Can limit be increased in promtail? If no I guess I need to change to Alloy.
I am sure there is a way here

Will this Work?
Also I am curious to know whether this unparsed data will ever reach reach to Loki?

2

Try max_message_length. See Configure Promtail | Grafana Loki documentation

3

Thank you it worked.