What's causing the sudden increase in failed message deliveries for WhatsApp Business API customers?

Introduction

The sudden increase in failed message deliveries for WhatsApp Business API customers is a critical issue that demands immediate attention. This problem directly impacts our service reliability and customer satisfaction. I'll approach this analysis systematically, focusing on identifying the root cause, validating hypotheses, and developing both short-term fixes and long-term solutions.

Step 1

Clarifying Questions (3 minutes)

• What's the specific timeframe for this "sudden increase"?

• Can you provide the current failure rate compared to our baseline?

• Are all API customers affected equally, or is there a pattern among specific segments?

• Have we implemented any recent changes to our API or infrastructure?

• Are there any patterns in the types of messages failing (e.g., text, media, templates)?

• Have we received any direct customer complaints or support tickets related to this issue?

Why these questions matter: Understanding the timeline helps isolate potential causes. Knowing the failure rate quantifies the problem's severity. Customer segmentation could reveal targeted issues. Recent changes might be the culprit. Message type patterns could indicate specific feature problems. Customer feedback provides real-world context.

Hypothetical answers:

• Increase noticed over the past 48 hours
• Failure rate jumped from 0.5% to 3%
• Affects all customers, but larger volume senders see higher failure rates
• API version update rolled out 72 hours ago
• No clear pattern in message types failing
• Several high-priority tickets opened by major customers

Impact on approach: These answers would focus our investigation on recent API changes, potential scalability issues, and the need for a quick resolution to maintain customer trust.