Description
Component(s)
No response
What happened?
Describe the bug
The otelhttp instrumentation in confighttp uses the URL path for span names:
opentelemetry-collector/config/confighttp/confighttp.go
Lines 468 to 470 in 2b5fa0e
According to https://opentelemetry.io/docs/specs/semconv/http/http-spans/#name:
HTTP span names SHOULD be {method} {target} if there is a (low-cardinality) target available. If there is no (low-cardinality) {target} available, HTTP span names SHOULD be {method}.
I realise it's a SHOULD and not a MUST, but I would expect OpenTelemetry Collector to be setting an example and following documented recommendations. Producing high cardinality span names can be problematic for certain pipelines, e.g. when aggregating spans by name.
Steps to reproduce
- Add trace telemetry to
examples/local/otel-config.yaml:
$ git diff
diff --git a/examples/local/otel-config.yaml b/examples/local/otel-config.yaml
index 168a1631a..3e6266e70 100644
--- a/examples/local/otel-config.yaml
+++ b/examples/local/otel-config.yaml
@@ -39,3 +39,10 @@ service:
exporters: [debug]
extensions: [zpages]
+ telemetry:
+ traces:
+ level: basic
+ processors:
+ - batch:
+ exporter:
+ console: {}make runcurl http://localhost:4318/foo/bar
What did you expect to see?
I would expect to see a span logged with the name GET, or something low-cardinality but more descriptive like GET unknown route.
What did you see instead?
A span is logged with the name /foo/bar:
{
"Name": "/foo/bar",
"SpanContext": {
"TraceID": "9a023a975a32440d01b47c6f8f7a60c7",
"SpanID": "aa890cf63d51904a",
"TraceFlags": "01",
"TraceState": "",
"Remote": false
},
...
Collector version
Environment information
Environment
OS: Ubuntu 24.04
Compiler: go 1.24.0
OpenTelemetry Collector configuration
extensions:
zpages:
endpoint: localhost:55679
receivers:
otlp:
protocols:
grpc:
endpoint: localhost:4317
http:
endpoint: localhost:4318
processors:
batch:
memory_limiter:
# 75% of maximum memory up to 2G
limit_mib: 1536
# 25% of limit up to 2G
spike_limit_mib: 512
check_interval: 5s
exporters:
debug:
verbosity: detailed
service:
pipelines:
traces:
receivers: [otlp]
processors: [memory_limiter, batch]
exporters: [debug]
metrics:
receivers: [otlp]
processors: [memory_limiter, batch]
exporters: [debug]
logs:
receivers: [otlp]
processors: [memory_limiter, batch]
exporters: [debug]
extensions: [zpages]
telemetry:
traces:
level: basic
processors:
- batch:
exporter:
console: {}Log output
{
"Name": "/foo/bar",
"SpanContext": {
"TraceID": "ca846f88686dc369615aa615b163a9cb",
"SpanID": "23a71a43a538f482",
"TraceFlags": "01",
"TraceState": "",
"Remote": false
},
"Parent": {
"TraceID": "00000000000000000000000000000000",
"SpanID": "0000000000000000",
"TraceFlags": "00",
"TraceState": "",
"Remote": false
},
"SpanKind": 2,
"StartTime": "2025-02-25T11:15:43.641507607+08:00",
"EndTime": "2025-02-25T11:15:43.641723584+08:00",
"Attributes": [
{
"Key": "http.method",
"Value": {
"Type": "STRING",
"Value": "GET"
}
},
{
"Key": "http.scheme",
"Value": {
"Type": "STRING",
"Value": "http"
}
},
{
"Key": "net.host.name",
"Value": {
"Type": "STRING",
"Value": "localhost"
}
},
{
"Key": "net.host.port",
"Value": {
"Type": "INT64",
"Value": 4318
}
},
{
"Key": "net.sock.peer.addr",
"Value": {
"Type": "STRING",
"Value": "127.0.0.1"
}
},
{
"Key": "net.sock.peer.port",
"Value": {
"Type": "INT64",
"Value": 47346
}
},
{
"Key": "user_agent.original",
"Value": {
"Type": "STRING",
"Value": "curl/8.5.0"
}
},
{
"Key": "http.target",
"Value": {
"Type": "STRING",
"Value": "/foo/bar"
}
},
{
"Key": "net.protocol.version",
"Value": {
"Type": "STRING",
"Value": "1.1"
}
},
{
"Key": "http.response_content_length",
"Value": {
"Type": "INT64",
"Value": 19
}
},
{
"Key": "http.status_code",
"Value": {
"Type": "INT64",
"Value": 404
}
}
],
"Events": null,
"Links": null,
"Status": {
"Code": "Unset",
"Description": ""
},
"DroppedAttributes": 0,
"DroppedEvents": 0,
"DroppedLinks": 0,
"ChildSpanCount": 0,
"Resource": [
{
"Key": "service.instance.id",
"Value": {
"Type": "STRING",
"Value": "1dd05082-b413-4990-af89-04751084d903"
}
},
{
"Key": "service.name",
"Value": {
"Type": "STRING",
"Value": "otelcorecol"
}
},
{
"Key": "service.version",
"Value": {
"Type": "STRING",
"Value": "0.120.0-dev"
}
}
],
"InstrumentationScope": {
"Name": "go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp",
"Version": "0.59.0",
"SchemaURL": "",
"Attributes": null
},
"InstrumentationLibrary": {
"Name": "go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp",
"Version": "0.59.0",
"SchemaURL": "",
"Attributes": null
}
}Additional context
No response