You are PM of FB Login used by 3rd parties and you notice successful logins metrics is down on a Monday morning. What will you do?

Introduction

The sudden drop in successful logins for Facebook Login used by third parties on a Monday morning is a critical issue that requires immediate attention. As the PM responsible for this feature, I'll approach this problem systematically to identify, validate, and address the root cause while considering both short-term fixes and long-term implications.

Step 1

Clarifying Questions (3 minutes)

• What's the exact percentage drop in successful logins compared to normal?

• Are all third-party integrations affected or only specific ones?

• When did we first notice the drop, and has it been consistent since then?

• Have there been any recent updates to the Facebook Login API or SDK?

• Are there any correlated increases in error rates or specific error types?

• Has there been any change in the monitoring systems or metric definitions?

Why these questions matter: Understanding the scope and specifics of the issue is crucial for targeted analysis. Hypothetical answers could reveal whether this is a widespread problem or limited to certain integrations, helping focus our investigation.