The goal is to detect speed regression of website access.

The elapsed time value is updated in the DB only if an arbitrary threshold is modified (<200ms = fast, <500ms = moderate, >500ms = slow).

Cetificates are monitored until they expired.

Calling datetime.datetime.now will produce local time, whereas utcnow will
result with UTC time.

/reviewed-on nexedi/surykatka!2

/reviewed-on !1

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