Apps usage graphs (classic Reports page)

• Choose your time-span. Each chart tracks a trend that occurs over a time-span you can specify. Choose a range from the previous week to six months.
• Identify active users. Some charts break down usage among users based on when they last accessed a service or synced their device, known as 1-day, 7-day, and 30-day actives. Use this information to identify how active your user base is.
• See day-to-day data. Click a graph's table or csv link to download data in either a table or comma-separate values (CSV) format. Here, you can see specific usage for each day.

• Total / Average Mail Usage. Tracks the total and average amounts of mail storage (in MB) being used across your organization.
• User Activity. Tracks the total the number of users who have performed an action in their email on a particular day (1-day actives) or within the past 7 or 30 days (7- or 30-day actives). Actions can include signing in, opening messages, working with labels, actions with webmail or pop clients, and more.

• User Activity. Tracks the total number of users who have performed an action in their calendars on a particular day (1-day actives) or within the past 7 or 30 days (7- or 30-day actives).

Note: Throughout these reports, a document can be any text document, spreadsheet, presentation, drawing, or form created in Google Docs, or any file uploaded to Google Drive.

These reports track:

• User Activity. Number of users who have viewed or edited an individual document on a particular day (1-day actives) or within the previous 7 or 30 days (7- or 30-day actives).
• Collaboration Summary Report. Total number of document creators and unique collaborators who have ever been invited to view or edit a document. A document creator is not counted as a collaborator unless they are later invited to read or edit the document. This report is not applicable to multiple domain accounts.
• Total Docs Created By Type. Total number of documents, by type, owned by users in your organization's domain. Documents moved to Trash and documents owned by users outside of your domain will not be included in this graph.
• Avg. # of users a doc is shared with. Average number of users who have been invited to view or edit a document on any given day, which can indicate how many people are co-authoring and reviewing content in your organization.
• Docs Creators Report. How many users have created up to 5, 10, 20, or 50+ documents.
• Docs Created/Modified/Viewed By Type (daily). Total number of each document type that was created, modified, or viewed in your organization on any given day.
• Aging Reports. Total number of documents that haven't been opened or modified for a significant period of time, which can indicate content that isn't being used or maintained.
• Docs Visibility Report. Total number of documents currently being made available via each Visibility setting, such as publicly on the internet, within your organization, privately, and so on.

• # of Active Mobile Devices. The number of active mobile devices in your domain. This report shows the number of 7-day active and 30-day active mobile devices syncing to your domain over time. 
• # of Mobile Devices by OS. The number of active devices by operating system.
• # of Mobile Devices by Type. The percentage of active devices in your domain syncing with Google via Google Sync or Android sync. Google Sync devices include phones connecting with Google via Microsoft® Exchange ActiveSync®, and often include iOS devices and Windows Phones.

• 7 day Active Chrome Devices. The number of Chrome devices that have synced to your domain in the past seven days.
• # of Chrome Devices by OS. The number of active Chrome devices, listed by operating system.

Additionally, some administrators may see a graph for # of Unverified Chrome Devices. This graph shows the number of provisioned Chrome devices booting in developer mode.