THIRD_PARTY_LICENSES/licenses/tower-0.5.3-c19b7c6f92/SOURCE_NOTICES.txt

Source-file copyright and license notices, preserved verbatim.

===== src/load/peak_ewma.rs (source SHA-256 24a5e76918466916009a981393383835bdf51081199705529e35a3f2c773222e) =====
/// Measures the load of the underlying service using Peak-EWMA load measurement.
///
/// [`PeakEwma`] implements [`Load`] with the [`Cost`] metric that estimates the amount of
/// pending work to an endpoint. Work is calculated by multiplying the
/// exponentially-weighted moving average (EWMA) of response latencies by the number of
/// pending requests. The Peak-EWMA algorithm is designed to be especially sensitive to
/// worst-case latencies. Over time, the peak latency value decays towards the moving
/// average of latencies to the endpoint.
///
/// When no latency information has been measured for an endpoint, an arbitrary default
/// RTT of 1 second is used to prevent the endpoint from being overloaded before a
/// meaningful baseline can be established..
///
/// ## Note
///
/// This is derived from [Finagle][finagle], which is distributed under the Apache V2
/// license. Copyright 2017, Twitter Inc.
///
/// [finagle]:
/// https://github.com/twitter/finagle/blob/9cc08d15216497bb03a1cafda96b7266cfbbcff1/finagle-core/src/main/scala/com/twitter/finagle/loadbalancer/PeakEwma.scala