Merge all the source metadata in a single “origin” metadata

Author: Frizlab

Sources/OSLogLogger.swift

@@ -77,10 +77,7 @@ public struct OSLogLogger : LogHandler {
 	public func log(level: Logging.Logger.Level, message: Logging.Logger.Message, metadata logMetadata: Logging.Logger.Metadata?, source: String, file: String, function: String, line: UInt) {
 		/* AFAICT os.Logger does not allow passing an “original log source” when logging, so we pass the log source in the metadata… */
 		let logMetadata = (logMetadata ?? [:]).merging([
-			Self.pubMetaPrefix + "__source":   "\(source)",
-			Self.pubMetaPrefix + "__fileID":   "\(file)",
-			Self.pubMetaPrefix + "__function": "\(function)",
-			Self.pubMetaPrefix + "__line":     "\(line)",
+			Self.pubMetaPrefix + "__origin":   "\(source):\(file):\(line) \(function)",
 		], uniquingKeysWith: { current, _ in current })
 
 		let effectiveFlatMetadata: (public: [String], private: [String])