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The grid (core) ยท console.warn

a 'history' shadow's time window needs a positive 'span' (ms) or 'minutes'; it had none, so it reported the original, unwindowed history.

Printed by The grid (core), prefixed [lattice], since 1.50.0.

Warnings referenceshadow.history.window.span:*

Identifier
shadow.history.window.span:*
Raised by
The grid (core)
Since
1.50.0

What happened

The window is a time window and has no usable length, so there is nothing to bucket the readings into. The shadow reports its full history instead.

The fix

Give the window a positive span in milliseconds, or minutes.

Reference

Covered in full at the API reference.