selectFromMin()

Attention

You must enable the SelectFromExtremaFunctions feature flag to use this function. See Enabling/Disabling Features for more information.

Selects the minimum value of the specified field, and then generates an event with the specified fields from the matching event.

Parameter	Type	Required	Default	Description
`field`	string	true		The names of the field to use to calculate minimum value.
`include`	[string]	true		The names of the fields to include in the generated event.

Find the first value of a field x (and when that value was from)?

Try

humio

selectFromMin(@timestamp, include=[x, @timestamp])

This selects the minimum value of @timestamp that contains an event with the specified field and the corresponding timestamp value.