Which of the following is an invalid @ modifier expression?
@
The @ modifier must immediately follow an instant-vector or range-vector selector. It cannot be applied to the result of sum(...); the timestamp modifier belongs inside the aggregation, attached to http_requests_total{method="GET"}. start() and end() are valid special values for this modifier.
sum(...)
http_requests_total{method="GET"}
start()
end()
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