Constant prometheus::DEFAULT_BUCKETS

pub const DEFAULT_BUCKETS: &[f64; 11] = &[0.005, 0.01, 0.025, 0.05, 0.1, 0.25, 0.5, 1.0, 2.5, 5.0, 10.0]

DEFAULT_BUCKETS are the default Histogram buckets. The default buckets are tailored to broadly measure the response time (in seconds) of a network service. Most likely, however, you will be required to define buckets customized to your use case.