Add OpenTelemetry diag logger

In order to get more information when our users encounter issues, the
OpenTelemetry diag logger is now enabled when the AppSignal log level is
set to trace.

.changesets/add-opentelemetry-diag-logger.md

@@ -0,0 +1,6 @@
+---
+bump: "patch"
+type: "add"
+---
+
+When the AppSignal log level is set to "trace". Additional information from the OpenTelemetry instrumentations is now logged.

src/client.ts

@@ -9,6 +9,7 @@ import { demo } from "./demo"
 import { VERSION } from "./version"
 import { setParams, setSessionData } from "./helpers"
 import { BaseLogger, Logger, LoggerFormat, LoggerLevel } from "./logger"
+import { diag, DiagConsoleLogger, DiagLogLevel } from "@opentelemetry/api"
 
 import { Instrumentation } from "@opentelemetry/instrumentation"
 import {
@@ -157,6 +158,7 @@ export class Client {
         this.#metrics = new Metrics()
         if (this.config.data.initializeOpentelemetrySdk) {
           this.#sdk = this.initOpenTelemetry()
+          this.setUpOpenTelemetryLogger()
         }
       }
     } else {
@@ -416,6 +418,17 @@ export class Client {
     return logger
   }
 
+  /**
+   * Sets up the OpenTelemetry diag logger based on our integration logger level.
+   * If our integration logger level is "silly" ("trace"), the OpenTelemetry diag debug messages
+   * are logged.
+   */
+  private setUpOpenTelemetryLogger(): void {
+    if (this.config.data["logLevel"] === "trace") {
+      diag.setLogger(new DiagConsoleLogger(), DiagLogLevel.DEBUG)
+    }
+  }
+
   /**
    * Stores the client in global object after initializing
    */