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docker: send alloy and loki logs to Loki

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Alloy is severely limited in this aspect. Maybe we should switch to
Vector instead.
This commit is contained in:
Vincent Bernat
2025-08-29 07:18:22 +02:00
parent 560113e3af
commit a50c47a723
1 changed files with 108 additions and 0 deletions
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108
docker/alloy/loki.alloy
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@@ -142,3 +142,111 @@ loki.process "redis" {
source = "message" source = "message"
} }
} }
discovery.relabel "alloy" {
targets = discovery.relabel.loki.output
rule {
source_labels = ["service_name"]
regex = "alloy"
action = "keep"
}
}
loki.source.docker "alloy" {
host = "unix:///var/run/docker.sock"
targets = discovery.relabel.alloy.output
forward_to = [loki.process.alloy.receiver]
}
loki.process "alloy" {
forward_to = [loki.write.default.receiver]
// ts=2025-08-28T09:30:45.497277819Z level=info msg="Scraped metadata watcher stopped" component_path=/ component_id=prometheus.remote_write.default subcomponent=rw remote_name=0ffafb url=http://prometheus:9090/prometheus/api/v1/write
stage.logfmt {
mapping = {
ts = "",
level = "",
msg = "",
err = "",
node = "",
component_path = "",
component_id = "",
}
}
stage.labels {
values = {
level = "",
}
}
stage.structured_metadata {
values = {
node = "",
component_path = "",
component_id = "",
}
}
stage.template {
source = "message"
template = `{{ .msg }}{{ if .err }}: {{ .err }}{{ end }}`
}
stage.timestamp {
source = "ts"
format = "RFC3339"
}
stage.output {
source = "message"
}
}
discovery.relabel "lokilogs" {
targets = discovery.relabel.loki.output
rule {
source_labels = ["service_name"]
regex = "loki"
action = "keep"
}
}
loki.source.docker "lokilogs" {
host = "unix:///var/run/docker.sock"
targets = discovery.relabel.lokilogs.output
forward_to = [loki.process.lokilogs.receiver]
}
loki.process "lokilogs" {
forward_to = [loki.write.default.receiver]
// ts=2025-08-29T05:07:45.543770684Z caller=spanlogger.go:116 middleware=QueryShard.astMapperware org_id=fake traceID=0dd74c5aaeb81d32 user=fake level=warn msg="failed mapping AST" err="context canceled" query="{service_name=\"alloy\"}"
stage.logfmt {
mapping = {
ts = "",
level = "",
msg = "",
err = "",
query = "",
caller = "",
org_id = "",
trace_id = "",
user = "",
}
}
stage.labels {
values = {
level = "",
}
}
stage.structured_metadata {
values = {
query = "",
caller = "",
org_id = "",
trace_id = "",
user = "",
}
}
stage.template {
source = "message"
template = `{{ .msg }}{{ if .err }}: {{ .err }}{{ end }}`
}
stage.timestamp {
source = "ts"
format = "RFC3339"
}
stage.output {
source = "message"
}
}