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Some timestamp functions can be safely wrapped as a step invariant. Then once we do that we never need to check or unwrap at evaluation time. For instance; `timestamp(metric @ 1)` is step invariant, whereas `timestamp(abs(metric @ 1))` is not. Currently all `timestamp` `*parser.Call` are excluded from being considered step invariant since it is listed in the `AtModifierUnsafeFunctions` map. This PR adds an extra check for timestamp functions which consider the arguments, and if the argument is a simple VectorSelector then the entire `*parser.Call` can be safely wrapped as a step invariant. Signed-off-by: Andrew Hall <andrew.hall@grafana.com> Co-authored-by: Bryan Boreham <bjboreham@gmail.com>