Support Winston child logger groups

When using the Winston transport for our logging feature, the child
loggers with an assigned group will send such group to AppSignal when
logging messages.

.changesets/support-winston-child-logger-groups-when-using-the-winston-transport.md

@@ -0,0 +1,9 @@
+---
+bump: "patch"
+type: "add"
+---
+
+Support Winston child logger groups when using the Winston transport
+
+When using the Winston transport for our logging feature, the child loggers with an assigned group
+will send the group to AppSignal when logging messages.

src/__tests__/winston_transport.test.ts

@@ -41,10 +41,10 @@ describe("BaseLogger", () => {
   })
 
   it("carries arguments passed to child loggers", () => {
-    const childLogger = logger.child({ child: "foo" })
+    const childLogger = logger.child({ child: "foo", group: "childgroup" })
     childLogger.info("child logger message", { argument: 123 })
     expect(client.extension.log).toHaveBeenCalledWith(
-      "groupname",
+      "childgroup",
       3,
       "child logger message",
       { child: "foo", argument: 123 }

src/winston_transport.ts

@@ -67,8 +67,18 @@ export class WinstonTransport extends Transport {
     const levelSeverity = severity(info[Symbol.for("level")])
 
     const [message, attributes] = this.parseInfo(info)
+    let group = undefined
+    if (typeof attributes["group"] == "string") {
+      group = attributes["group"]
+      delete attributes["group"]
+    }
 
-    client.extension.log(this.#group, levelSeverity, message, attributes)
+    client.extension.log(
+      group || this.#group,
+      levelSeverity,
+      message,
+      attributes
+    )
 
     callback()
   }