By definition, if you can see effects then the metrics have enough resolution.
The specific resolution is the Nyquist frequency - that part is accurate.
The specific resolution is the Nyquist frequency - that part is accurate.
Similarly, sample count/interval limits in tsdbs like prometheus are not downsampling. They're just skipping samples. This also creates aliasing. Can be very noticeable especially if you combine it with rate/derivative functions.