[exporter/debug] feat: add dropped* attributes to output

.chloggen/fix-14202.yaml

@@ -0,0 +1,25 @@
+# Use this changelog template to create an entry for release notes.
+
+# One of 'breaking', 'deprecation', 'new_component', 'enhancement', 'bug_fix'
+change_type: enhancement
+
+# The name of the component, or a single word describing the area of concern, (e.g. receiver/otlp)
+component: exporter/debug
+
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: "Added logging for dropped attributes, events, and links counts in debug exporter OTLP text traces marshaler."
+
+# One or more tracking issues or pull requests related to the change
+issues: [14202]
+
+# (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:
+
+# Optional: The change log or logs in which this entry should be included.
+# e.g. '[user]' or '[user, api]'
+# Include 'user' if the change is relevant to end users.
+# Include 'api' if there is a change to a library API.
+# Default: '[user]'
+change_logs: [user]

exporter/debugexporter/internal/otlptext/testdata/traces/traces_with_entity_refs.out

@@ -29,3 +29,6 @@ Span #0
     End time       : 1970-01-01 00:00:00 +0000 UTC
     Status code    : Unset
     Status message : 
+    DroppedAttributesCount: 0
+    DroppedEventsCount: 0
+    DroppedLinksCount: 0

exporter/debugexporter/internal/otlptext/testdata/traces/two_spans.out

@@ -16,6 +16,7 @@ Span #0
     End time       : 2020-02-11 20:26:13.000000789 +0000 UTC
     Status code    : Error
     Status message : status-cancelled
+    DroppedAttributesCount: 1
 Events:
 SpanEvent #0
      -> Name: event-with-attr
@@ -27,6 +28,8 @@ SpanEvent #1
      -> Name: event
      -> Timestamp: 2020-02-11 20:26:13.000000123 +0000 UTC
      -> DroppedAttributesCount: 2
+    DroppedEventsCount: 1
+    DroppedLinksCount: 0
 Span #1
     Trace ID       : 
     Parent ID      : 
@@ -37,6 +40,8 @@ Span #1
     End time       : 2020-02-11 20:26:13.000000789 +0000 UTC
     Status code    : Unset
     Status message : 
+    DroppedAttributesCount: 0
+    DroppedEventsCount: 0
 Links:
 SpanLink #0
      -> Trace ID: 
@@ -50,3 +55,4 @@ SpanLink #1
      -> ID: 
      -> TraceState: 
      -> DroppedAttributesCount: 4
+    DroppedLinksCount: 3

exporter/debugexporter/internal/otlptext/traces.go

@@ -4,6 +4,8 @@
 package otlptext // import "go.opentelemetry.io/collector/exporter/debugexporter/internal/otlptext"
 
 import (
+	"strconv"
+
 	"go.opentelemetry.io/collector/pdata/ptrace"
 )
 
@@ -50,8 +52,11 @@ func (textTracesMarshaler) MarshalTraces(td ptrace.Traces) ([]byte, error) {
 				buf.logAttr("Status message", span.Status().Message())
 
 				buf.logAttributes("Attributes", span.Attributes())
+				buf.logAttr("DroppedAttributesCount", strconv.FormatUint(uint64(span.DroppedAttributesCount()), 10))
 				buf.logEvents("Events", span.Events())
+				buf.logAttr("DroppedEventsCount", strconv.FormatUint(uint64(span.DroppedEventsCount()), 10))
 				buf.logLinks("Links", span.Links())
+				buf.logAttr("DroppedLinksCount", strconv.FormatUint(uint64(span.DroppedLinksCount()), 10))
 			}
 		}
 	}