Decorrelated jitter v2 explorer

[reisenberger]

The issue or feature being addressed

Add a demonstrator app for the new decorrelated jitter v2 formula

This code is adapted from https://gist.github.com/reisenberger/2b696bec50d4bf059831c451f0a0cea9, originally at https://gist.github.com/george-polevoy/c0c36c3c22c9c1fe67821b1d8255413a . The original author/credit for that code is george-polevoy . Code used with permission as described at App-vNext/Polly#530 (comment)

This code verifies and demonstrates that the coefficients chosen in the Polly.Contrib.WaitAndRetry Backoff.DecorrelatedJitterBackoffV2(...) implementation generate a series of retry times whose 50th percentiles (medians) fall broadly in exponential backoff by powers of 2.

Any single individual sequence obtained from the iterator will (intentionally) show variation from this - that is the jitter. This code demonstrates (by taking a large enough sample to average out the jitter again) that the broad behaviour is exponential backoff.

The code also outputs (as csv) the distribution of retry times (over the sample set), at each try; and combined over all tries. Visualizing these (for example in PowerBI or Excel) shows the smooth distribution of the formula, as discussed in Polly issue 530 or in the readme of this repo.

Confirm the following

• I have merged the latest changes from the master branch
• I have targeted the PR against a DecorrelatedJitterV2Explorer branch