William Dauchy 18a2c6ed49 MINOR: contrib/prometheus-exporter: better output of Not-a-Number
Not necessarily mandatory but I saw a few prometheus client parsing only
`NaN`. Also most librarries do output `NaN`

Signed-off-by: William Dauchy <wdauchy@gmail.com>
2021-01-25 15:53:28 +01:00
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