diff --git a/pkg/logs/client/http/destination.go b/pkg/logs/client/http/destination.go
index 2a189da..e85b822 100644
--- a/pkg/logs/client/http/destination.go
+++ b/pkg/logs/client/http/destination.go
@@ -133,6 +133,7 @@ func (d *Destination) unconditionalSend(payload []byte) (err error) {
 		// this can happen when the method or the url are valid.
 		return err
 	}
+	req.Header.Set("User-Agent", "categraf")
 	req.Header.Set("CATEGRAF-API-KEY", d.apiKey)
 	req.Header.Set("Content-Type", d.contentType)
 	req.Header.Set("Content-Encoding", d.contentEncoding.name())
diff --git a/pkg/logs/input/channel/tailer.go b/pkg/logs/input/channel/tailer.go
index bae9535..797aaa8 100644
--- a/pkg/logs/input/channel/tailer.go
+++ b/pkg/logs/input/channel/tailer.go
@@ -15,7 +15,7 @@ import (
 )
 
 // serviceEnvVar is the environment variable of the service tag (this is used only for the serverless agent)
-const serviceEnvVar = "DD_SERVICE"
+const serviceEnvVar = "FC_SERVICE"
 
 // Tailer consumes and processes a channel of strings, and sends them to a stream of log messages.
 type Tailer struct {
diff --git a/pkg/logs/message/origin.go b/pkg/logs/message/origin.go
index 2787761..37a5b2e 100644
--- a/pkg/logs/message/origin.go
+++ b/pkg/logs/message/origin.go
@@ -39,11 +39,11 @@ func (o *Origin) TagsPayload() []byte {
 
 	source := o.Source()
 	if source != "" {
-		tagsPayload = append(tagsPayload, []byte("[dd ddsource=\""+source+"\"]")...)
+		tagsPayload = append(tagsPayload, []byte("[fc fcsource=\""+source+"\"]")...)
 	}
 	sourceCategory := o.LogSource.Config.SourceCategory
 	if sourceCategory != "" {
-		tagsPayload = append(tagsPayload, []byte("[dd ddsourcecategory=\""+sourceCategory+"\"]")...)
+		tagsPayload = append(tagsPayload, []byte("[fc fcsourcecategory=\""+sourceCategory+"\"]")...)
 	}
 
 	var tags []string
@@ -51,7 +51,7 @@ func (o *Origin) TagsPayload() []byte {
 	tags = append(tags, o.tags...)
 
 	if len(tags) > 0 {
-		tagsPayload = append(tagsPayload, []byte("[dd ddtags=\""+strings.Join(tags, ",")+"\"]")...)
+		tagsPayload = append(tagsPayload, []byte("[fc fctags=\""+strings.Join(tags, ",")+"\"]")...)
 	}
 	if len(tagsPayload) == 0 {
 		tagsPayload = []byte{}