Exponential decorrelated jitter backoff from Polly project based on https://aws.amazon.com/blogs/architecture/exponential-backoff-and-jitter/, see an example https://play.golang.org/p/sHOTAI6wGht.

backoff.go

package main

import (
	"fmt"
	"math"
	"math/rand"
	"time"
)

func main() {
	// Initialize the default source of uniformly-distributed pseudo-random numbers.
	rand.Seed(time.Now().UnixNano())

	// Make 6 retries with exponential backoff and 1 hour of max wait time between attempts.
	// The first delay of 200 seconds is a multiplier that increases the wait intervals.
	const (
		maxRetries        = 6
		maxSeconds        = 3600.
		firstDelaySeconds = 200.
	)
	retries := backoff(maxRetries, maxSeconds, firstDelaySeconds)
	fmt.Println(retries)
}

const (
	// pFactor is a factor used within the formula to help smooth the first calculated delay.
	pFactor = 4.0
	// rpScalingFactor is a factor used to scale the median values of the retry times
	// generated by the formula to be near whole seconds, to aid user comprehension.
	// This factor allows the median values to fall approximately at 1, 2, 4, ... seconds,
	// instead of 1.4, 2.8, 5.6, 11.2.
	rpScalingFactor = 1 / 1.4
)

// backoff is the exponential "Decorrelated Jitter" backoff from Polly project
// based on https://aws.amazon.com/blogs/architecture/exponential-backoff-and-jitter/.
// Read more https://github.com/Polly-Contrib/Polly.Contrib.WaitAndRetry#new-jitter-recommendation and
// https://github.com/Polly-Contrib/Polly.Contrib.WaitAndRetry/blob/master/src/Polly.Contrib.WaitAndRetry/Backoff.DecorrelatedJitterV2.cs.
func backoff(maxRetries int, maxSeconds, firstDelaySeconds float64) []float64 {
	retries := make([]float64, maxRetries)

	var prev float64
	for i := 0; i < maxRetries; i++ {
		t := float64(i) + rand.Float64()
		next := math.Pow(2, t) * math.Tanh(math.Sqrt(pFactor*t))

		retries[i] = math.Min(
			(next-prev)*rpScalingFactor*firstDelaySeconds,
			maxSeconds,
		)
		prev = next
	}

	return retries
}

Here is a Go package that does the same thing https://github.com/marselester/backoff.