pub fn severity_levels(mut self, input: crate::model::SeverityLevel) -> Self {
            let mut v = self.severity_levels.unwrap_or_default();
            v.push(input);
            self.severity_levels = Some(v);
            self
        }
/// Appends an item to `severity_levels`.
///
/// To override the contents of this collection use [`set_severity_levels`](Self::set_severity_levels).
///
/// <p>The available severity levels for the support case. Available severity levels are defined by your service level agreement with Amazon Web Services.</p>
Appends an item to `severity_levels`.
To override the contents of this collection use [`set_severity_levels`](Self::set_severity_levels).

The available severity levels for the support case. Available severity levels are defined by your service level agreement with Amazon Web Services.
Appends an item to ` severity_levels ` . To override the contents of this collection use [ ` set_severity_levels ` ] ( Self :: set_severity_levels ) . The available severity levels for the support case . Available severity levels are defined by your service level agreement with Amazon Web Services .
pub fn severity_levels(mut self, input: crate::model::SeverityLevel) -> Self {
            let mut v = self.severity_levels.unwrap_or_default();
            v.push(input);
            self.severity_levels = Some(v);
            self
        }
pub fn severity_levels ( mut self , input : crate :: model :: SeverityLevel ) -> Self { let mut v = self . severity_levels . unwrap_or_default ( ) ; v . push ( input ) ; self . severity_levels = Some ( v ) ; self }
Appends an item to `severity_levels`.
Appends an item to ` severity_levels ` .
mut self
input
crate::model::SeverityLevel
mut self
input
crate::model::SeverityLevel