diff --git a/packages/core/src/client.ts b/packages/core/src/client.ts
index 778d03b7541c..37d475a5cbde 100644
--- a/packages/core/src/client.ts
+++ b/packages/core/src/client.ts
@@ -56,6 +56,7 @@ import { safeUnref } from './utils/timer';
 import { convertSpanJsonToTransactionEvent, convertTransactionEventToSpanJson } from './utils/transactionEvent';
 import { maybeWarnAboutIgnoredTransactionOptions } from './utils/warnAboutIgnoredTransactionOptions';
 import { resolveDataCollectionOptions } from './utils/data-collection/resolveDataCollectionOptions';
+import { ATTRIBUTE_METADATA } from '@sentry/conventions';
 
 const ALREADY_SEEN_ERROR = "Not capturing exception because it's already been captured.";
 const MISSING_RELEASE_FOR_SESSION_ERROR = 'Discarded session because of missing or non-string release';
@@ -256,6 +257,11 @@ export abstract class Client<O extends ClientOptions = ClientOptions> {
       DEBUG_BUILD && debug.warn('No DSN provided, client will not send events.');
     }
 
+    debug.log(`I have ${Object.keys(ATTRIBUTE_METADATA).length} attributes I can assign`);
+    Object.keys(ATTRIBUTE_METADATA).forEach(attribute => {
+      debug.log(`Attribute: ${attribute}`);
+    });
+
     const { beforeSendSpan, traceLifecycle } = this._options;
     // A `beforeSendSpan` callback is only invoked for the span format matching the trace lifecycle,
     // so a mismatch means it is silently never called.