[fbreceivier] inject log level

libbeat/otelbeat/beatconverter/beatconverter.go

@@ -111,6 +111,12 @@ func (c converter) Convert(_ context.Context, conf *confmap.Conf) error {
 			beatReceiverConfigKey + "::output::otelconsumer": nil,
 		}
 
+		// inject log level
+		level, _ := config.MustNewConfigFrom(receiverCfg.ToStringMap()).String("logging.level", -1)
+		if level != "" {
+			out["service::telemetry::logs::level"] = getOTeLLogLevel(level)
+		}
+
 		err = conf.Merge(confmap.NewFromStringMap(out))
 		if err != nil {
 			return err

libbeat/otelbeat/beatconverter/logging.go

@@ -0,0 +1,35 @@
+// Licensed to Elasticsearch B.V. under one or more contributor
+// license agreements. See the NOTICE file distributed with
+// this work for additional information regarding copyright
+// ownership. Elasticsearch B.V. licenses this file to you under
+// the Apache License, Version 2.0 (the "License"); you may
+// not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied.  See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+package beatconverter
+
+import "strings"
+
+func getOTeLLogLevel(level string) string {
+	switch strings.ToLower(level) {
+	case "debug":
+		return "DEBUG"
+	case "info":
+		return "INFO"
+	case "warning":
+		return "WARN"
+	case "error", "critical":
+		return "ERROR"
+	default:
+		return ""
+	}
+}