Allow whitespace in tag values and remove tag value replacement character

Author: cleptric

packages/core/src/metrics/constants.ts

@@ -21,7 +21,7 @@ export const NAME_AND_TAG_KEY_NORMALIZATION_REGEX = /[^a-zA-Z0-9_/.-]+/g;
  *
  * See: https://develop.sentry.dev/sdk/metrics/#normalization
  */
-export const TAG_VALUE_NORMALIZATION_REGEX = /[^\w\d_:/@.{}[\]$-]+/g;
+export const TAG_VALUE_NORMALIZATION_REGEX = /[^\w\d\s_:/@.{}[\]$-]+/g;
 
 /**
  * This does not match spec in https://develop.sentry.dev/sdk/metrics

packages/core/src/metrics/utils.ts

@@ -62,7 +62,7 @@ export function sanitizeTags(unsanitizedTags: Record<string, Primitive>): Record
   for (const key in unsanitizedTags) {
     if (Object.prototype.hasOwnProperty.call(unsanitizedTags, key)) {
       const sanitizedKey = key.replace(NAME_AND_TAG_KEY_NORMALIZATION_REGEX, '_');
-      tags[sanitizedKey] = String(unsanitizedTags[key]).replace(TAG_VALUE_NORMALIZATION_REGEX, '_');
+      tags[sanitizedKey] = String(unsanitizedTags[key]).replace(TAG_VALUE_NORMALIZATION_REGEX, '');
     }
   }
   return tags;