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A dynamic distribution group is created dynamically when an email is being sent to the particular group based on some pre-defined rules or conditions. When configuring such a group, you need to choose the type of recipients who need to be automatically added as members of the group, and also define the other rules that govern membership. The group will be dynamically created with members who are of the recipient type chosen and who fulfill the defined rules.

Since these groups are auto-created, administrators may, on a daily basis, have to manually check whether any new dynamic distribution group has been created or not. Likewise, since the group configuration may also change dynamically, administrators will also need to keep reviewing the configuration periodically to capture modifications. For similar reasons, empty groups may also go undetected by administrators. To enable administrators to easily and efficiently manage dynamic distribution groups, it will be good practice to periodically run the O365DycDistbGrpTest test.

This test promptly alerts administrators when a new dynamic distribution group is created, modified, or deleted. Furthermore, the test also notifies administrators if any dynamic distribution group is found to be empty or orphaned. To know which dynamic distribution groups were newly created, modified, deleted, orphaned, or empty, you can use the detailed statistics reported by this test.

Outputs of the test : One set of results for the Office 365 tenant being monitored.

Measurement	Description	Measurement Unit	Interpretation
Modified_groups	Indicates the number of dynamic distribution groups that were modified during the last measurement period.	Number	Use the detailed diagnosis of this measure to know which groups were modified and when.
Newly_created_groups	Indicates the number of groups that were newly created during the last measurement period.	Number	Use the detailed diagnosis of this measure to know which groups were created, when.
Soft_deleted_groups	Indicates the number of groups that have been soft-deleted.	Number	If you have deleted an Office 365 group, by default it's retained for 30 days. This 30-day period is called “soft-delete” because you can still restore the group. After 30 days, the group and associated content is permanently deleted and cannot be restored. During the “soft-delete” period if a user tries to access the site they will get a 403 forbidden message. After this period if the user tries to access the site they will get a 404 not found message. Use the detailed diagnosis of this measure to know which groups were soft-deleted and when.
Total_groups	Indicates the total number of dynamic distribution groups.	Number
Orphaned_groups	Indicates the number of groups that are orphaned/ownerless.	Number	If a group owner leaves your company the group could find itself without an owner. Such a group is called an Orphaned group. The content in the group is unaffected by this - the content belongs to the group and isn't tied to the owner's account. But not having a group owner means there's nobody with permissions to manage the group. Use the detailed diagnosis of this measure to know which groups are orphaned / ownerless.
Empty_groups	Indicates the number of groups that are empty currently.	Number	Use the detailed diagnosis of this measure to identify the empty groups. If any group is found to be empty for too long a time, you may want to delete such a group.