Update 0146-metrics-prototype-scenarios.md (open-telemetry#159)

Add a note about temperature recordings being potentially negative. Co-authored-by: Joshua MacDonald <jmacd@users.noreply.github.com>
carlosalberto · May 25, 2021 · e9a38e3 · e9a38e3
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diff --git a/oteps/metrics/0146-metrics-prototype-scenarios.md b/oteps/metrics/0146-metrics-prototype-scenarios.md
@@ -181,6 +181,9 @@ speaking it is not considered as a "dimension" from the SDK perspective.
 | --------- | --------------- |
 | MachineA  | 65.3            |
 
+Note: Temperature may take on negative values. For this reason, you must choose the instrument carefully to ensure it is one that
+can accept negative recordings and that they can be aggregated appropriately.
+
 **Server humidity:**
 
 | Host Name | Humidity (%) |