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The return value of functions relating to the current time, e.g. time(), is set by promtool to start at timestamp 0 at the start of a test's evaluation. This has the very nice consequence that tests can run reliably without depending on when they are run. It does, however, mean that tests will give out results that can be unexpected by users. If this behaviour is documented, then users will be empowered to write tests for their rules that use time-dependent functions. (Closes: prometheus/docs#1464) Signed-off-by: Gabriel Filion <lelutin@torproject.org>