Internal
Counts the top-level metadata keys that count towards MAX_OBSERVATION_METADATA_KEYS. Keys whose values are null, undefined, functions or symbols are not written, so they don't count.
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Metadata to count keys of
Number of keys that would be written
Counts the top-level metadata keys that count towards MAX_OBSERVATION_METADATA_KEYS. Keys whose values are
null,undefined, functions or symbols are not written, so they don't count.