pub fn usage(mut self, input: crate::model::UsageByAccount) -> Self {
            let mut v = self.usage.unwrap_or_default();
            v.push(input);
            self.usage = Some(v);
            self
        }
/// Appends an item to `usage`.
///
/// To override the contents of this collection use [`set_usage`](Self::set_usage).
///
/// <p>An array of objects that contains usage data and quotas for the account. Each object contains the data for a specific usage metric and the corresponding quota.</p>
Appends an item to `usage`.
To override the contents of this collection use [`set_usage`](Self::set_usage).

An array of objects that contains usage data and quotas for the account. Each object contains the data for a specific usage metric and the corresponding quota.
Appends an item to ` usage ` . To override the contents of this collection use [ ` set_usage ` ] ( Self :: set_usage ) . An array of objects that contains usage data and quotas for the account . Each object contains the data for a specific usage metric and the corresponding quota .
pub fn usage(mut self, input: crate::model::UsageByAccount) -> Self {
            let mut v = self.usage.unwrap_or_default();
            v.push(input);
            self.usage = Some(v);
            self
        }
pub fn usage ( mut self , input : crate :: model :: UsageByAccount ) -> Self { let mut v = self . usage . unwrap_or_default ( ) ; v . push ( input ) ; self . usage = Some ( v ) ; self }
Appends an item to `usage`.
Appends an item to ` usage ` .
mut self
input
crate::model::UsageByAccount
mut self
input
crate::model::UsageByAccount