Prometheus exporter: Errors logged in the OpenTelemetry collector

[ziomill]

Hi guys,

I'm trying to set up my observability stack by using OpenTelemetry collector (v0.60.0), Prometheus and Grafana. Our microservices are SpringBoot (2.6) based, shipped with Micrometer and instrumented with OpenTelemetry auto instrumentation agent.

All the stack seems to work with success (metrics and traces are correctly sent to backend systems) but I see these errors in the OTel collector logs. What do they mean?

Thank you

2022-09-16T08:53:48.899Z	error	[email protected]/log.go:34	error gathering metrics: 4 error(s) occurred:
2022-09-16T08:53:48.900252800Z * collected metric queueSize label:<name:"job" value:"users-api" > label:<name:"spanProcessorType" value:"BatchSpanProcessor" > gauge:<value:0 >  has help "The number of spans queued" but should have "The number of logs queued"
2022-09-16T08:53:48.900269200Z * collected metric queueSize label:<name:"job" value:"orders-api" > label:<name:"spanProcessorType" value:"BatchSpanProcessor" > gauge:<value:0 >  has help "The number of spans queued" but should have "The number of logs queued"
2022-09-16T08:53:48.900276900Z * collected metric queueSize label:<name:"job" value:"shop-api-gateway" > label:<name:"spanProcessorType" value:"BatchSpanProcessor" > gauge:<value:0 >  has help "The number of spans queued" but should have "The number of logs queued"
2022-09-16T08:53:48.900283500Z * collected metric queueSize label:<name:"job" value:"products-api" > label:<name:"spanProcessorType" value:"BatchSpanProcessor" > gauge:<value:0 >  has help "The number of spans queued" but should have "The number of logs queued"
2022-09-16T08:53:48.900290100Z 	{"kind": "exporter", "data_type": "metrics", "name": "prometheus"}
2022-09-16T08:53:48.900296600Z github.com/open-telemetry/opentelemetry-collector-contrib/exporter/prometheusexporter.(*promLogger).Println
2022-09-16T08:53:48.900301900Z 	github.com/open-telemetry/opentelemetry-collector-contrib/exporter/[email protected]/log.go:34
2022-09-16T08:53:48.900307700Z github.com/prometheus/client_golang/prometheus/promhttp.HandlerForTransactional.func1
2022-09-16T08:53:48.900313000Z 	github.com/prometheus/[email protected]/prometheus/promhttp/http.go:139
2022-09-16T08:53:48.900318900Z net/http.HandlerFunc.ServeHTTP
2022-09-16T08:53:48.900324200Z 	net/http/server.go:2084
2022-09-16T08:53:48.900329100Z net/http.(*ServeMux).ServeHTTP
2022-09-16T08:53:48.900351900Z 	net/http/server.go:2462
2022-09-16T08:53:48.900357300Z go.opentelemetry.io/collector/config/confighttp.(*decompressor).wrap.func1
2022-09-16T08:53:48.900361300Z 	go.opentelemetry.io/[email protected]/config/confighttp/compression.go:162
2022-09-16T08:53:48.900365900Z net/http.HandlerFunc.ServeHTTP
2022-09-16T08:53:48.900370200Z 	net/http/server.go:2084
2022-09-16T08:53:48.900374200Z go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp.(*Handler).ServeHTTP
2022-09-16T08:53:48.900378300Z 	go.opentelemetry.io/contrib/instrumentation/net/http/[email protected]/handler.go:204
2022-09-16T08:53:48.900382300Z go.opentelemetry.io/collector/config/confighttp.(*clientInfoHandler).ServeHTTP
2022-09-16T08:53:48.900387500Z 	go.opentelemetry.io/[email protected]/config/confighttp/clientinfohandler.go:39
2022-09-16T08:53:48.900391800Z net/http.serverHandler.ServeHTTP
2022-09-16T08:53:48.900395600Z 	net/http/server.go:2916
2022-09-16T08:53:48.900400200Z net/http.(*conn).serve
2022-09-16T08:53:48.900404900Z 	net/http/server.go:1966