You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: _ops_metadata_filter.rs
    path of file: ./repos/aws-sdk-rust/sdk/ssm/src/types
    
    the code of the file until where you have to start completion: // Code generated by software.amazon.smithy.rust.codegen.smithy-rs. DO NOT EDIT.

/// <p>A filter to limit the number of OpsMetadata objects displayed.</p>
#[non_exhaustive]
#[derive(::std::clone::Clone, ::std::cmp::PartialEq, ::std::fmt::Debug)]
pub struct OpsMetadataFilter {
    /// <p>A filter key.</p>
    pub key: ::std::string::String,
    /// <p>A filter value.</p>
    pub values: ::std::vec::Vec<::std::string::String>,
}
impl OpsMetadataFilter {
    /// <p>A filter key.<
    
    pub fn build(self) -> ::std::result::Result<crate::types::OpsMetadataFilter, ::aws_smithy_types::error::operation::BuildError> {
        ::std::result::Result::Ok(crate::types::OpsMetadataFilter {
            key: self.key.ok_or_else(|| {
                ::aws_smithy_types::error::operation::BuildError::missing_field(
                    "key",
                    "key was not specified but it is required when building OpsMetadataFilter",
                )
            })?,
            values: self.values.ok_or_else(|| {
                ::aws_smithy_types::error::operation::BuildError::missing_field(
                    "values",
                    "values was not specified but it is required when building OpsMetadataFilter",
                )
            })?,
        })
    }