Specify required integer limits (#1328)

open-telemetry · Jan 13, 2021 · d4d2020 · d4d2020
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diff --git a/specification/sdk-environment-variables.md b/specification/sdk-environment-variables.md
@@ -2,6 +2,7 @@
 
 The goal of this specification is to unify the environment variable names between different OpenTelemetry SDK implementations. SDKs MAY choose to allow configuration via the environment variables in this specification, but are not required to. If they do, they SHOULD use the names listed in this document.
 
+If an SDK chooses to support an integer-valued environment variable, it SHOULD support nonnegative values between 0 and 2³¹ − 1 (inclusive). Individual SDKs MAY choose to support a larger range of values.
 For variables which accept a known value out of a set, i.e., an enum value, SDK implementations MAY support additional values not listed here.
 For variables accepting an enum value, if the user provides a value the SDK does not recognize, the SDK MUST generate a warning and gracefully ignore the setting.