Add coding guideline for optional fields.

Specify to use pointers to represent optional fields. This is a follow up to: open-telemetry#9478.
mackjmr · Oct 3, 2024 · 443fb34 · 443fb34
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diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
@@ -294,6 +294,10 @@ To guarantee backward-compatible behavior, all configuration packages should sup
 
 Users should always initialize the config struct with this function and overwrite anything as needed.
 
+### Optional Fields
+
+Use pointers to represent optional fields in configuration to distinguish between unset values and zero values.
+
 ### Startup Error Handling
 
 Verify configuration during startup and fail fast if the configuration is invalid.