From e20fe3cee167d2d4a16a3e9344ccf3fb307ccf3a Mon Sep 17 00:00:00 2001
From: braydonk <braydonk@google.com>
Date: Fri, 3 Oct 2025 13:51:26 +0000
Subject: [PATCH 1/2] consumererror: Add partial error type

This PR adds functionality for consumers to create a partial error type.
This will allow consumers to properly report partial success/failure with
failed item counts, which can subsequently be used when reporting
sent/failed metrics.
---
 .chloggen/consumererror_partial_success.yaml | 25 +++++++++++
 consumer/consumererror/partial.go            | 44 ++++++++++++++++++++
 consumer/consumererror/partial_test.go       | 19 +++++++++
 3 files changed, 88 insertions(+)
 create mode 100644 .chloggen/consumererror_partial_success.yaml
 create mode 100644 consumer/consumererror/partial.go
 create mode 100644 consumer/consumererror/partial_test.go

diff --git a/.chloggen/consumererror_partial_success.yaml b/.chloggen/consumererror_partial_success.yaml
new file mode 100644
index 00000000000..4d479b03eb8
--- /dev/null
+++ b/.chloggen/consumererror_partial_success.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. otlpreceiver)
+component: consumererror
+
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: Add new partial error type to consumererror to allow consumers to report partial successes.
+
+# One or more tracking issues or pull requests related to the change
+issues: [13423]
+
+# (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: []
diff --git a/consumer/consumererror/partial.go b/consumer/consumererror/partial.go
new file mode 100644
index 00000000000..a401565b487
--- /dev/null
+++ b/consumer/consumererror/partial.go
@@ -0,0 +1,44 @@
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
+package consumererror // import "go.opentelemetry.io/collector/consumer/consumererror"
+
+import "errors"
+
+type partialError struct {
+	inner  error
+	failed int
+}
+
+var _ error = partialError{}
+
+func (pe partialError) Error() string {
+	return pe.inner.Error()
+}
+
+func (pe partialError) Unwrap() error {
+	return pe.inner
+}
+
+func (pe partialError) Failed() int {
+	return pe.failed
+}
+
+// NewPartial creates a new partial error. This is used by consumers
+// to report errors where only a subset of the total items failed
+// to be written, but it is not possible to tell which particular items
+// failed.
+func NewPartial(err error, failed int) error {
+	return NewPermanent(partialError{
+		inner:  err,
+		failed: failed,
+	})
+}
+
+// AsPartial checks if an error was wrapped with the NewPartial function,
+// or if it contains one such error in its Unwrap() tree.
+func AsPartial(err error) (partialError, bool) {
+	var pe partialError
+	ok := errors.As(err, &pe)
+	return pe, ok
+}
diff --git a/consumer/consumererror/partial_test.go b/consumer/consumererror/partial_test.go
new file mode 100644
index 00000000000..54f246db9e1
--- /dev/null
+++ b/consumer/consumererror/partial_test.go
@@ -0,0 +1,19 @@
+package consumererror
+
+import (
+	"errors"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestPartial(t *testing.T) {
+	internalErr := errors.New("some points failed")
+	err := NewPartial(internalErr, 5)
+	assert.True(t, IsPermanent(err))
+	partialErr, ok := AsPartial(err)
+	assert.True(t, ok)
+	assert.Equal(t, 5, partialErr.Failed())
+	assert.Equal(t, internalErr, partialErr.Unwrap())
+	assert.Equal(t, internalErr.Error(), partialErr.Error())
+}

From e3b4ff4e1bde4088dfa6ad843d6bdab00413fad5 Mon Sep 17 00:00:00 2001
From: braydonk <braydonk@google.com>
Date: Fri, 3 Oct 2025 13:53:43 +0000
Subject: [PATCH 2/2] add licenses

---
 consumer/consumererror/partial_test.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/consumer/consumererror/partial_test.go b/consumer/consumererror/partial_test.go
index 54f246db9e1..00c3979e58e 100644
--- a/consumer/consumererror/partial_test.go
+++ b/consumer/consumererror/partial_test.go
@@ -1,3 +1,6 @@
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
 package consumererror
 
 import (