Comments (3)
iwinux
commented on May 27, 2024
Got the same problem here, with collectd 5.5.0 and collectd_exporter 0.2.0.
Tracked down to expfmt.MetricFamilyToText(), but I have no idea why a counter could be recognized as a gauge.
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iwinux
commented on May 27, 2024
There're actually two errors alternating:
expected counter in metric collectd_nginx_connectionsexpected gauge in metric collectd_nginx_connections
A possible cause is: multiple different metrics (with Dstype gauge and derive) share the same name, which confuses Prometheus's API.
Here's my debug code:
diff --git a/main.go b/main.go
index 4b0f14e..5fd960f 100644
--- a/main.go
+++ b/main.go
@@ -113,7 +113,14 @@ func newMetric(vl api.ValueList, index int) (prometheus.Metric, error) {
return nil, fmt.Errorf("unknown value type: %T", v)
}
- return prometheus.NewConstMetric(newDesc(vl, index), valueType, value)
+ name := newName(vl, index)
+ desc := newDesc(vl, index)
+
+ if name == "collectd_nginx_connections" {
+ log.Printf("%v\n", desc)
+ }
+
+ return prometheus.NewConstMetric(desc, valueType, value)
}
type collectdCollector struct {And this is what I got:
$ ./collectd_exporter -log.level=debug
INFO[0000] Starting Server: :9103 file=main.go line=273
INFO[0010] Desc{fqName: "collectd_nginx_connections", help: "Collectd exporter: 'nginx' Type: 'nginx_connections' Dstype: 'api.Gauge' Dsname: 'value'", constLabels: {instance="zerus",nginx="waiting"}, variableLabels: []}
file=main.go line=120
INFO[0010] Desc{fqName: "collectd_nginx_connections", help: "Collectd exporter: 'nginx' Type: 'connections' Dstype: 'api.Derive' Dsname: 'value'", constLabels: {instance="zerus",nginx="handled"}, variableLabels: []}
file=main.go line=120
INFO[0010] Desc{fqName: "collectd_nginx_connections", help: "Collectd exporter: 'nginx' Type: 'nginx_connections' Dstype: 'api.Gauge' Dsname: 'value'", constLabels: {instance="zerus",nginx="writing"}, variableLabels: []}
file=main.go line=120
INFO[0010] Desc{fqName: "collectd_nginx_connections", help: "Collectd exporter: 'nginx' Type: 'nginx_connections' Dstype: 'api.Gauge' Dsname: 'value'", constLabels: {instance="zerus",nginx="active"}, variableLabels: []}
file=main.go line=120
INFO[0010] Desc{fqName: "collectd_nginx_connections", help: "Collectd exporter: 'nginx' Type: 'connections' Dstype: 'api.Derive' Dsname: 'value'", constLabels: {instance="zerus",nginx="accepted"}, variableLabels: []}
file=main.go line=120
INFO[0010] Desc{fqName: "collectd_nginx_connections", help: "Collectd exporter: 'nginx' Type: 'nginx_connections' Dstype: 'api.Gauge' Dsname: 'value'", constLabels: {instance="zerus",nginx="reading"}, variableLabels: []}
file=main.go line=120
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iwinux
commented on May 27, 2024
FYI, this is how write_graphite plugin of collectd concats the "labels":
collectd.zerus.nginx.connections.accepted.value
collectd.zerus.nginx.connections.handled.value
collectd.zerus.nginx.nginx_connections.active.value
collectd.zerus.nginx.nginx_connections.reading.value
collectd.zerus.nginx.nginx_connections.waiting.value
collectd.zerus.nginx.nginx_connections.writing.value
collectd.zerus.nginx.nginx_requests.value
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