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Etienne PerotandgVisor bot
ba61bf6e93
This introduces a `metric.FieldValue` struct type that wraps a string. All metric interfaces that deal with field values have been updated to use pointers to this type instead of strings. The intent of this change is to make it more obvious that field values must be passed using references. Prior to this change, this was done using string pointer comparisons. Now this must be done by using a pointer to the same `metric.FieldValue` struct. The struct type still externally exposes its string so that it can be referred to in value function callbacks by "custom" metrics. (Though there are no current uses of callback metrics with fields.) PiperOrigin-RevId: 527030738