[pkg/inframetadata] Improve warning when host-identifying attributes …

…are missing (#314)

* [pkg/inframetadata] Improve warning when host-identifying attributes are missing

* Update mx-psi_improve-warning.yaml

.chloggen/mx-psi_improve-warning.yaml

@@ -0,0 +1,16 @@
+# One of 'breaking', 'deprecation', 'new_component', 'enhancement', 'bug_fix'
+change_type: bug_fix
+
+# The name of the component (e.g. pkg/quantile)
+component: pkg/inframetadata
+
+# A brief description of the change. Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: Fixes warning log where resource attributes were not correctly logged
+
+# The PR related to this change
+issues: [314]
+
+# (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:

pkg/inframetadata/reporter.go

@@ -109,7 +109,10 @@ func (r *Reporter) pushAndLog(ctx context.Context, hm payload.HostMetadata) {
 func (r *Reporter) hostname(res pcommon.Resource) (string, bool) {
 	src, ok := attributes.SourceFromAttrs(res.Attributes())
 	if !ok {
-		r.logger.Warn("resource does not have host-identifying attributes", zap.Any("attributes", res.Attributes()))
+		r.logger.Warn("resource does not have host-identifying attributes",
+			zap.Any("attributes", res.Attributes().AsRaw()),
+			zap.String("further info", "https://docs.datadoghq.com/opentelemetry/schema_semantics/hostname/?tab=datadogexporter"),
+		)
 		return "", false
 	}
 	if src.Kind != source.HostnameKind {