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Label Loki streams with the Compose service name as service_name

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Without an explicit service_name, Loki derived it from the container
label (ledgerline-sanctions-1), while spans carry service.name
"sanctions". Grafana's Tempo->Loki link selects on
{service_name="<service.name>"}, so it matched no stream. The czy agent
now sets service_name from com.docker.compose.service; `container` is
unchanged. CLAUDE.md's description of the labels is updated to match.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Movses Aslanyan
2026-10-13 21:18:55 +03:30
co-authored by Claude Opus 5.5
parent bc11638a15
commit 2c18962243
2 changed files with 17 additions and 4 deletions
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CLAUDE.md
+5 -3
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@@ -341,9 +341,11 @@ curl -s -u "$A" 'https://prometheus.vione.cloud/api/v1/status/tsdb' | jq '.data.
```
**Logs (Loki)** — confirm `trace_id` is actually in the payload, not just
in the code that was supposed to put it there. The czy agent labels streams with
the full container name (`container` and `service_name` are both e.g.
`ledgerline-gateway-1`):
in the code that was supposed to put it there. The czy agent labels each stream
with `container` (the full container name, e.g. `ledgerline-gateway-1`) and
`service_name` (the Compose service name, e.g. `gateway`, matching the spans'
`service.name` so Grafana's Tempo→Loki link selects the right stream). Streams
from before that relabel (2026-10-13) have `service_name` = the container name:
```bash
curl -s -u "$A" -G 'https://loki.vione.cloud/loki/api/v1/query_range' \
--data-urlencode 'query={container="ledgerline-gateway-1"} | json | trace_id != ""' \
observability/alloy-agent/config.alloy
+12 -1
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@@ -4,7 +4,8 @@
// (ansible/roles/observability/templates/grafana-stack/config/alloy/config.alloy.j2),
// moved here because the platform itself now runs on k3s (k8s/), where there is
// no Docker socket. Components are unchanged except loki.write, which pushes
// to the cluster's Loki over HTTPS with basic auth instead of http://loki:3100.
// to the cluster's Loki over HTTPS with basic auth instead of http://loki:3100,
// and one extra relabel rule that sets service_name (see below).
//
// OTLP is NOT received here: apps send spans to the platform's Alloy at
// https://otlp.vione.cloud (k8s/alloy/config.alloy).
@@ -25,6 +26,16 @@ discovery.relabel "docker" {
regex = "/(.*)"
target_label = "container"
}
// Not in the Ansible config. Without it Loki derives service_name from
// `container` (ledgerline-sanctions-1), while spans carry service.name
// "sanctions" -- and Grafana's Tempo->Loki link selects on
// {service_name="<service.name>"}, so it matched no stream. The Compose
// service name is the services/ directory name, i.e. the OTel service.name.
rule {
source_labels = ["__meta_docker_container_label_com_docker_compose_service"]
target_label = "service_name"
}
}
loki.source.docker "local" {