Ignore service.name starting with service_unknown

Signed-off-by: Arve Knudsen <arve.knudsen@gmail.com>

.chloggen/bugfix_target-info-required-attrs.yaml

@@ -15,7 +15,7 @@ issues: [32148]
 # (Optional) One or more lines of additional information to render under the primary note.
 # These lines will be padded with 2 spaces and then inserted directly into the document.
 # Use pipe (|) for multiline entries.
-subtext:
+subtext: 'If the service.name resource attribute starts with "unknown_service", it is considered undefined'
 
 # If your change doesn't affect end users or the exported elements of any package,
 # you should instead start your pull request title with [chore] or use the "Skip Changelog" label.

pkg/translator/prometheusremotewrite/helper.go

@@ -151,6 +151,10 @@ func timeSeriesSignature(datatype string, labels []prompb.Label) string {
 // logged. Resulting label names are sanitized.
 func createAttributes(resource pcommon.Resource, attributes pcommon.Map, externalLabels map[string]string, extras ...string) []prompb.Label {
 	serviceName, haveServiceName := resource.Attributes().Get(conventions.AttributeServiceName)
+	// SDKs operate with a default service name prefixed with "unknown_service", we should treat such values as undefined.
+	if haveServiceName && strings.HasPrefix(serviceName.AsString(), "unknown_service") {
+		haveServiceName = false
+	}
 	instance, haveInstanceID := resource.Attributes().Get(conventions.AttributeServiceInstanceID)
 
 	// Calculate the maximum possible number of labels we could return so we can preallocate l

pkg/translator/prometheusremotewrite/helper_test.go

@@ -523,6 +523,10 @@ func TestAddResourceTargetInfo(t *testing.T) {
 	resourceWithOnlyServiceID := pcommon.NewResource()
 	resourceWithOnlyServiceID.Attributes().PutStr(conventions.AttributeServiceInstanceID, "service-instance-id")
 	resourceWithOnlyServiceID.Attributes().PutStr("resource_attr", "resource-attr-val-1")
+	// SDKs operate with a default service name prefixed with "unknown_service", we should treat such values as undefined.
+	resourceWithOnlyUnknownServiceName := pcommon.NewResource()
+	resourceWithOnlyUnknownServiceName.Attributes().PutStr(conventions.AttributeServiceName, "unknown_service: java")
+	resourceWithOnlyUnknownServiceName.Attributes().PutStr("resource_attr", "resource-attr-val-1")
 	for _, tc := range []struct {
 		desc      string
 		resource  pcommon.Resource
@@ -605,6 +609,12 @@ func TestAddResourceTargetInfo(t *testing.T) {
 				},
 			},
 		},
+		{
+			desc:      "with resource including unknown_service: java for service.name, and missing service.instance.id resource attribute",
+			resource:  resourceWithOnlyUnknownServiceName,
+			timestamp: testdata.TestMetricStartTimestamp,
+			expected:  map[string]*prompb.TimeSeries{},
+		},
 		{
 			desc:      "with valid resource, with namespace",
 			resource:  resourceWithOnlyServiceName,