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For resolutions to alert conditions, see also Alert Resolutions.

For information on creating and managing alerts, see Manage Alert Configurations and Manage Alerts.

Cannot Turn Off Email Notifications

There are at least two ways to turn off alert notifications:

Receive Duplicate Alerts

If the notification email list contains multiple email-groups, one or more people may receive multiple notifications of the same alert.

Receive “Host has low open file limits” or “Too many open files” error messages

These error messages appear on the Deployment page, under a host’s name. They appear if the number of available connections does not meet the Cloud Manager-defined minimum value. These errors are not generated by the mongos instance and, therefore, not appear in mongos log files.

On a host by host basis, the Monitoring compares the number of open file descriptors and connections to the maximum connections limit. The max open file descriptors ulimit parameter directly affects the number of available server connections. The agent calculates whether or not enough connections exist to meet the Cloud Manager-defined minimum value.

In ping documents, for each node and its serverStatus.connections values, if the sum of the current value plus the available value is less than the maxConns configuration value set for a monitored host, the Monitoring will send a Host has low open file limits or Too many open files message to Cloud Manager.

Ping documents are data sent by Monitorings to Cloud Manager. To view ping documents:


To access this feature, you must be have the Project Owner or Project Data Access Admin Cloud Manager user roles.

  1. Click the Deployment page.
  2. Click the host’s name.
  3. Click Last Ping.

To prevent this error, we recommend you set ulimit open files to 64000. We also recommend setting the maxConns command in mongosh to at least the recommended settings.

To learn more, see the MongoDB ulimit reference page and the the MongoDB maxConns reference page.


Additional Information on Projects

Create a project to monitor additional segregated systems or environments for servers, agents, users, and other resources.


Firewalls may separate your deployment among two or more environments. In this case, you would need two or more separate Cloud Manager projects.

API keys are unique to each project. Each project requires its own agent with the appropriate API keys. Within each project, the agent needs to be able to connect to all hosts it monitors in the project.

To learn more about creating and managing projects, see Projects.

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