> For the complete documentation index, see [llms.txt](https://stephen-tsoi.gitbook.io/stephen-tsoi-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://stephen-tsoi.gitbook.io/stephen-tsoi-docs/messaging-troubleshooting/a-missing-event-among-billions-how-we-found-it-on-an-event-mesh.md).

# 🥇 A Missing Event Among Billions? How We Found It on an Event Mesh

A master diagnostic index and runbook mapping 8 real-world troubleshooting scenarios to detect, trace, and recover missing single events among billions inside an enterprise Event Mesh.

Have you ever been asked to find a single missing event among billions of events? Event-Driven Architecture (EDA) is inherently a distributed design, where an end-to-end business flow often spans multiple components and systems. As a result, troubleshooting can be extremely challenging. This series of posts explains the many reasons why an event can go missing and explores common issues through eight real-world cases. By understanding these scenarios, architects and engineers can diagnose problems more effectively and build more resilient event-driven systems.

1. Why do events get lost? <https://lnkd.in/gb6rE5dJ>
2. Retry Logic on the Publisher: <https://lnkd.in/guwBhZhb>
3. Retry Logic on the Publisher -&#x20;
   1. TCP Layer: <https://lnkd.in/gV2WmgMq>
   2. Client Messaging Library Layer: <https://lnkd.in/gy8rJ2DM>
   3. Application Layer: <https://lnkd.in/gDN5DAjy>
   4. Event Broker Failover or Network Disconnect <https://lnkd.in/gc_Ccy3s>
   5. Subscriber Responsibility with a Broker when Event Broker Failover or Network Disconnect: <https://lnkd.in/gi39_Jvf>
4. How to Find Missing Events: <https://lnkd.in/gkHFbgcx>
5. Trouble Shooting on the Application Side <https://lnkd.in/gsyh_2wa>
6. Use Case 1 - Kerberos Authentication Connection Failure <https://lnkd.in/gZ2RfchV>
7. Use Case 2 - OAuth authentication via MQTT Connection Failure <https://lnkd.in/ghpxKP5c>
8. Use Case 3: Trouble Shooting on the Application Side 1 - Terminated Connection on client-side <https://lnkd.in/gr_uZv5Z>
9. Use Case 4: Trouble Shooting on the Application Side 2 - Connection Paused <https://lnkd.in/gwQDTwnj>
10. Use Case 5: Premature Publication: <https://lnkd.in/gi2fN-5E>
11. Use Case 6: Filtered by APM: <https://lnkd.in/gNkaSTgE>
12. Use Case 7: Unexpected Consumer: <https://lnkd.in/gwYESuxE>
13. Use Case 8: Non-Completed Receipt: <https://lnkd.in/gcCYcx8f>

✍️Article: [Needle in a Haystack: Finding Missing Events on an Event Mesh](https://solace.com/blog/finding-missing-events-on-event-mesh/)

<figure><img src="https://2617374589-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FcQN1DZY6gJZPxlsQf9Re%2Fuploads%2FGuWdRvJaTiyGxpOJaBov%2Fimage.png?alt=media&amp;token=4f2dcba2-3eb0-4630-8d59-db32a3e2dcd5" alt=""><figcaption></figcaption></figure>

## 🚀 Let's Connect Beyond GitBook!

If you found this article helpful, you can find more of my technical insights, daily discussions, and deep dives across these platforms:

* **Read more of my work:** Check out my articles on [dev.to](https://dev.to/stephen_tsoi_5b2c4055f3a9) and [Hashnode](https://stephentsoi.hashnode.dev/).
* **Join the daily conversation:** Connect with me directly on [LinkedIn](https://www.linkedin.com/in/stephen-tsoi-16309730/).

***

#### 📬 Stay Ahead of the Curve

Enjoyed this piece? I break down complex technical topics into bite-sized, actionable insights every week.

👉 **Subscribe to my** [**LinkedIn Newsletter**](https://www.linkedin.com/build-relation/newsletter-follow?entityUrn=7487299517642612736) to never miss an update and get the latest articles delivered straight to your feed!


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:

```
GET https://stephen-tsoi.gitbook.io/stephen-tsoi-docs/messaging-troubleshooting/a-missing-event-among-billions-how-we-found-it-on-an-event-mesh.md?ask=<question>&goal=<endgoal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.

The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.