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By default, each SharePoint Online site is allocated 1 TB of storage space for its use. Some sites however may be more actively used or may contain more files than the rest; such sites may hence utilize more storage. To identify such sites, use the Site Usage Summary test.

This test monitors the workload of sites in terms of page views, visits, and file activity, and reports how this demand impacts storage usage across sites. Detailed diagnostics reveals those sites with a high level of activity. Additionally, the test also looks for sites that are using more than a configured percentage of storage space allocated to them, and reports the count of such sites (if any). Detailed metrics will point you to the exact sites that are using up storage resources excessively. With the help of the detailed metrics, you can correlate the load on the individual sites with their storage allocation and usage. In the process, you can figure out if any site requires additional storage space to handle its current demand.

This test uses the Microsoft Graph API. Tests that use Microsoft Graph API may not start reporting metrics right away. Sometimes, they may go without reporting metrics for over 48 hours. This is normal behavior, and it occurs because, Microsoft does not collect/refresh the metrics as frequently as the test executes.

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

Measurement	Description	Measurement Unit	Interpretation
Total_sites	Indicates the total number of sites for this tenant on SharePoint Online.	Number
Active_sites	Indicates the number of active sites.	Number	An active site is a SharePoint Online site that has seen some activity in terms of page views, page visits, or any file activity (eg., creation, modification, deletion). To view the sites that were active recently, use the detailed diagnosis of this measure.
No_of_files	Indicates the total number of files across site collections.	Number	Use the detailed diagnosis of this measure to know which sites have the maximum number of files.
Active_file	Indicates the number of active files.	Number	Use the detailed diagnosis of this measure to know which sites have the maximum number of active files - i.e., files that have been accessed recently.
Active_file	Indicates what percentage of total files is active.	Percent	A high value of this measure indicates that the tenant is accessing or working with SharePoint files very frequently.
Page_views	Indicates the number of times pages on sites were viewed.	Number	To know which sites have the maximum number of page views, use the detailed diagnosis of this measure.
visitedPg	Indicates the number of web pages visited across SharePoint Online sites.	Number	To know which sites have the maximum number of page visits, use the detailed diagnosis of this measure.
Site_consuming	Indicates the number of sites that are consuming the allocated storage resources excessively.	Number	The value of this measure will be incremented by 1 if the percent storage usage of any site is more than the percentage configured against the STORAGE PERCENTAGE LIMIT parameter. Ideally, the value of this measure should be 0. A non-zero value indicates that one/more web sites are over-utilizing the storage space allocated to them. To know which sites they are, use the detailed diagnosis of this measure.
Storage_used	Indicates the amount of storage currently used across sites.	GB
Strgalctd_site	Indicates the total amount of storage space allocated across sites.	GB
StrgUsed	Indicates the percentage of allocated storage that is currently in use across sites.	Percent	A value close to 100% indicates a probable storage space crunch, owing to excessive space usage by one/more sites. In such a situation, use the detailed diagnosis of the Sites consuming high storage measure to know which sites are hogging storage resources.