What caused the sudden 30% increase in failed transactions for Clickatell's WhatsApp Business API integrations yesterday?

Introduction

The sudden 30% increase in failed transactions for Clickatell's WhatsApp Business API integrations is a critical issue that demands immediate attention. This analysis will systematically identify, validate, and address the root cause while considering both short-term fixes and long-term strategic implications.

Step 1

Clarifying Questions (3 minutes)

• Looking at the timing, I'm thinking this could be related to a recent deployment. Has there been any significant update or change to the WhatsApp Business API integration in the last 48 hours?

Why it matters: Recent changes often correlate with sudden performance shifts. Expected answer: Yes, a minor update was pushed yesterday morning. Impact on approach: If confirmed, we'd focus on rollback options and code review.

• Considering the scale of the issue, I'm wondering about its distribution. Is this 30% increase uniform across all clients, or are certain segments more affected?

Why it matters: Helps identify if the issue is systemic or localized to specific user groups. Expected answer: The increase is more pronounced among enterprise clients. Impact on approach: We'd prioritize investigating enterprise-specific integrations or usage patterns.

• Given the nature of API integrations, I'm curious about error patterns. Are there specific error codes or messages associated with these failed transactions?

Why it matters: Error patterns can quickly point to specific system components or failure modes. Expected answer: Yes, we're seeing an increase in timeout errors. Impact on approach: This would lead us to focus on performance bottlenecks or capacity issues.

• Thinking about external dependencies, has there been any communication from WhatsApp about changes or issues on their end?

Why it matters: External partner changes can significantly impact API performance. Expected answer: No official communication, but there are reports of WhatsApp instability. Impact on approach: We'd need to coordinate with WhatsApp and possibly implement temporary workarounds.