[exporter/datadog] make error retryable if logs sender received nil r…

…esponse (open-telemetry#28672)

**Description:** <Describe what has changed.>
<!--Ex. Fixing a bug - Describe the bug and how this fixes the issue.
Ex. Adding a feature - Explain what this achieves.-->
The Datadog exporter threats network/connectivity errors (HTTP client
doesn't receive a response) as permanent errors, which can lead to log
records loss. This change makes these errors retryable.

**Link to tracking Issue:** open-telemetry#24550

**Testing:** <Describe what testing was performed and which tests were
added.>

**Documentation:** <Describe the documentation added.>

.chloggen/retry-on-connectivity-issue.yaml

@@ -0,0 +1,27 @@
+# Use this changelog template to create an entry for release notes.
+
+# One of 'breaking', 'deprecation', 'new_component', 'enhancement', 'bug_fix'
+change_type: bug_fix
+
+# The name of the component, or a single word describing the area of concern, (e.g. filelogreceiver)
+component: datadogexporter
+
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: Fixes potential log records loss on a transient network/connectivity error
+
+# Mandatory: One or more tracking issues related to the change. You can use the PR number here if no issue exists.
+issues: [24550]
+
+# (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: "The Datadog exporter threats network/connectivity errors (http client doesn't receive a response) as permanent errors, which can lead to log records loss. This change makes these errors retryable."
+
+# 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.
+# 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: []

exporter/datadogexporter/internal/logs/sender.go

@@ -8,7 +8,6 @@ import (
 
 	"github.com/DataDog/datadog-api-client-go/v2/api/datadog"
 	"github.com/DataDog/datadog-api-client-go/v2/api/datadogV2"
-	"go.opentelemetry.io/collector/consumer/consumererror"
 	"go.opentelemetry.io/collector/exporter/exporterhelper"
 	"go.uber.org/zap"
 
@@ -85,9 +84,9 @@ func (s *Sender) handleSubmitLog(ctx context.Context, batch []datadogV2.HTTPLogI
 			s.logger.Error("Failed to send logs", zap.Error(err), zap.String("msg", string(b[:n])), zap.String("status_code", r.Status))
 			return err
 		}
-		// If response is nil assume permanent error.
-		// The error will be logged by the exporter helper.
-		return consumererror.NewPermanent(err)
+		// If response is nil keep an error retryable
+		// Assuming this is a transient error (e.g. network/connectivity blip)
+		return err
 	}
 	return nil
 }