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Application data is generated by applications, including mobile apps, and pushed to backend services. This data includes user-generated data, like a name and shipping address collected as part of a sales transaction. It also includes data generated by the application, such as log data. Event data, like clickstream data, is also a type of application-generated data. The volume of this kind of data depends on the number of users of the application, the types of data the application generates, and the duration of time the application is in use. This size of application data that is sent in a single operation can vary widely. A clickstream event may have less than 1KB of data, whereas an image upload could be multiple megabytes. Examples of application data include the following:

 Transactions from an online retail application

 Clickstream data from users reading articles on a news site

 Log data from a server running computer-aided design software

 User registration data from an online service

Application data can be ingested by services running in Compute Engine, Kubernetes Engine, or App Engine, for example. Application data can also be written to Stackdriver Logging or one of the managed databases, such as Cloud SQL or Cloud Datastore.