### Understand the alert

This alert is triggered when the Redis server fails to save the RDB snapshot to disk. This can indicate issues with the disk, the Redis server itself, or other factors affecting the save operation.

### Troubleshoot the alert

1. **Check Redis logs**: Inspect the Redis logs to identify any error messages or issues related to the failed RDB save operation. You can typically find the logs in `/var/log/redis/redis-server.log`.

2. **Verify disk space**: Ensure that your server has enough disk space available for the RDB snapshot. Insufficient disk space can cause the save operation to fail.

3. **Check disk health**: Use disk health monitoring tools like `smartctl` to inspect the health of the disk where the RDB snapshot is being saved.

4. **Review Redis configuration**: Check your Redis server's configuration file (`redis.conf`) for any misconfigurations or settings that may be causing the issue. Ensure that the `dir` and `dbfilename` options are correctly set.

5. **Monitor server resources**: Monitor your server's resources, such as CPU and RAM usage, to ensure that they are not causing issues with the save operation.

6. **Restart Redis**: If the issue persists, consider restarting the Redis server to clear any temporary issues or stuck processes.

### Useful resources

1. [Redis Configuration Documentation](https://redis.io/topics/config)
2. [Redis Persistence Documentation](https://redis.io/topics/persistence)
3. [Redis Troubleshooting Guide](https://redis.io/topics/problems)
