# How to fix synchronization failures with the Health Monitor
The **Health Monitor** gives you real-time visibility on the health of your product data catalog synchronizations.\
It helps you detect issues early, understand what went wrong, and take action quickly.
{% hint style="info" %}
**Use the Health Monitor to:**
* Check the status of Catalog, Recommendations, Merchandising, Analytics and Search
* View recent sync and deployment operations
* Understand errors with human-readable explanations
* Retry a failed synchronization
* Monitor the number of imported products
* Enable email notifications when issues occur
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### Where to find the Health Monitor ?
In App2 > Setting > Recommendations & Merchandising → Health Monitor
### **What to find in the overview Health Monitor ?**
The **Overview** displays everything you need to know at a glance.
#### Alert Banner
If a recent issue occurred (e.g., failed sync), an alert banner will appear at the top of the page with a quick summary and a link to investigate.
#### Operation History
The history lists all recent operations:
* Catalog synchronizations
* Deployments
* Imports
* Updates
Each operation shows whether it was a success or a failure, the date and time, the duration of the synchronization, and hover buttons to access to the [viewing operations details](#what-to-fin-in-the-viewing-operation-details) details and relaunch this specific synchronization in case it's failure.
Use this history to track what happened and when.
#### Available soon : service Status Indicators
**Meaning of badge colors :**
| Color | Meaning |
| --------- | ------------------------------- |
| 🟢 Green | Everything works normally |
| 🟡 Yellow | Something unusual detected |
| 🔴 Red | A sync or deployment has failed |
### What to find in the viewing operation details?
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The operation details modal shows what happened during the sync:
* the type of operation,
* timestamps,
* duration,
* and whether it succeeded or failed.
\
If something went wrong ?
You’ll see the root cause, a clear explanation, the impacted services, and options to retry the sync or confirm that you fixed the issue.
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#### How to setup catalog volume guard to protect your catalog?
To avoid publishing an incomplete catalog, you can choose the percentage threshold that will trigger a blocked sync.\
Go to *Settings → Recommendations & Merchandising* and select the % of product count deviation you want to allow.\
If the deviation exceeds this threshold, the sync is automatically blocked.
#### How to setup email notifications to stay informed ?
Regarding the notifications mail, you can receive alerts when:
* A sync fails
* A deployment fails
* A sync succeeds
To enable notifications go to **User Settings → Notifications → Health Monitor**
Emails include:
* A summary of the issue
* What it means
* What you can do
* A link to open the Health Monitor
#### Still stuck?
Contact your CSM or Support with:
* The operation ID
* The sync timestamp
* The error displayed
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