diff --git a/x-pack/elastic-agent/CHANGELOG.next.asciidoc b/x-pack/elastic-agent/CHANGELOG.next.asciidoc
index ee61d98a3189..83691ac62318 100644
--- a/x-pack/elastic-agent/CHANGELOG.next.asciidoc
+++ b/x-pack/elastic-agent/CHANGELOG.next.asciidoc
@@ -115,6 +115,6 @@
 - Log output of container to $LOGS_PATH/elastic-agent-start.log when LOGS_PATH set {pull}25150[25150]
 - Use `filestream` input for internal log collection. {pull}25660[25660]
 - Enable agent to send custom headers to kibana/ES {pull}26275[26275]
-- Set `agent.id` to the Fleet Agent ID in events published from inputs backed by Beats. {issue}21121[21121] {pull}26394[26394]
+- Set `agent.id` to the Fleet Agent ID in events published from inputs backed by Beats. {issue}21121[21121] {pull}26394[26394] {pull}26548[26548]
 - Enable configuring monitoring namespace {issue}26439[26439]
 - Communicate with Fleet Server over HTTP2. {pull}26474[26474]
diff --git a/x-pack/elastic-agent/pkg/agent/operation/monitoring.go b/x-pack/elastic-agent/pkg/agent/operation/monitoring.go
index 17188321b565..4712759ab70c 100644
--- a/x-pack/elastic-agent/pkg/agent/operation/monitoring.go
+++ b/x-pack/elastic-agent/pkg/agent/operation/monitoring.go
@@ -339,6 +339,16 @@ func (o *Operator) getMonitoringFilebeatConfig(outputType string, output interfa
 		"output": map[string]interface{}{
 			outputType: output,
 		},
+		"processors": []map[string]interface{}{
+			{
+				"add_fields": map[string]interface{}{
+					"target": "agent",
+					"fields": map[string]interface{}{
+						"id": o.agentInfo.AgentID(),
+					},
+				},
+			},
+		},
 	}
 
 	o.logger.Debugf("monitoring configuration generated for filebeat: %v", result)
@@ -563,6 +573,16 @@ func (o *Operator) getMonitoringMetricbeatConfig(outputType string, output inter
 		"output": map[string]interface{}{
 			outputType: output,
 		},
+		"processors": []map[string]interface{}{
+			{
+				"add_fields": map[string]interface{}{
+					"target": "agent",
+					"fields": map[string]interface{}{
+						"id": o.agentInfo.AgentID(),
+					},
+				},
+			},
+		},
 	}
 
 	o.logger.Debugf("monitoring configuration generated for metricbeat: %v", result)