Invalid default flow config on Debian

[bricewge]

What's wrong?

After installing grafana-agent-flow on Debian 12, the service won't start because the default flow config is invalid.

I had to make the folowing changes to cat /etc/grafana-agent-flow.river :

--- grafana-agent-flow.river.orig       2023-11-17 18:17:29.927141344 +0100
+++ grafana-agent-flow.river    2023-11-17 18:02:52.020537699 +0100
@@ -5,14 +5,14 @@
        level = "warn"
 }

-prometheus.exporter.unix {
+prometheus.exporter.unix "default" {
        include_exporter_metrics = true
        disable_collectors       = ["mdadm"]
 }

 prometheus.scrape "default" {
        targets = concat(
-               prometheus.exporter.unix.targets,
+               prometheus.exporter.unix.default.targets,
                [{
                        // Self-collect metrics
                        job         = "agent",

As a noob, it wasn't trivial as reading the documentation about syntax language because it doesn't contain a pattern on how to access labeled block; the textual description « In these cases the label will be used to disambiguate between multiple top-level blocks of the same name. » didn't helped.

Steps to reproduce

apt-get install grafana-agent-flow
systemctl start grafana-agent-flow.service
journalctl -u grafana-agent-flow.service 

System information

Debian GNU/Linux 12 (bookworm)

Software version

Grafana Agent Flow v0.37.4

Configuration

No response

Logs

Nov 17 17:37:49 test-multiphp-v2 systemd[1]: Started grafana-agent-flow.service - Vendor-neutral programmable observability pipelines..
Nov 17 17:37:49 test-multiphp-v2 grafana-agent-flow[4036870]: ts=2023-11-17T16:37:49.286196808Z level=info "boringcrypto enabled"=false
Nov 17 17:37:49 test-multiphp-v2 grafana-agent-flow[4036870]: Error: /etc/grafana-agent-flow.river:8:1: Component "prometheus.exporter.unix" must have
Nov 17 17:37:49 example systemd[1]: Started grafana-agent-flow.service - Vendor-neutral programmable observability pipelines..
Nov 17 17:37:49 example grafana-agent-flow[4036870]: ts=2023-11-17T16:37:49.286196808Z level=info "boringcrypto enabled"=false                        Nov 17 17:37:49 example grafana-agent-flow[4036870]: Error: /etc/grafana-agent-flow.river:8:1: Component "prometheus.exporter.unix" must have a label
Nov 17 17:37:49 example grafana-agent-flow[4036870]: 7 |
Nov 17 17:37:49 example grafana-agent-flow[4036870]: 8 | prometheus.exporter.unix {
Nov 17 17:37:49 example grafana-agent-flow[4036870]:   | ^^^^^^^^^^^^^^^^^^^^^^^^
Nov 17 17:37:49 example grafana-agent-flow[4036870]: 9 |     include_exporter_metrics = true
Nov 17 17:37:49 example grafana-agent-flow[4036870]: Error: /etc/grafana-agent-flow.river:15:3: component "prometheus.exporter.unix.targets" does not exist
Nov 17 17:37:49 example grafana-agent-flow[4036870]: 14 |     targets = concat(
Nov 17 17:37:49 example grafana-agent-flow[4036870]: 15 |         prometheus.exporter.unix.targets,
Nov 17 17:37:49 example grafana-agent-flow[4036870]:    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^
Nov 17 17:37:49 example grafana-agent-flow[4036870]: 16 |         [{
Nov 17 17:37:49 example grafana-agent-flow[4036870]: Error: could not perform the initial load successfully
Nov 17 17:37:49 example systemd[1]: grafana-agent-flow.service: Main process exited, code=exited, status=1/FAILURE
Nov 17 17:37:49 example systemd[1]: grafana-agent-flow.service: Failed with result 'exit-code'.

[paguardiolle]

Same issue on Debian 12.
Thanks for the workaround.