FailureCause: The cause for the update failure. Possible values are: - "TOO_LARGE": A batch request was issued with more events than are allowed in a single batch. - "TIME_PERIOD_EXPIRED": A batch was sent with data too far in the past to record. - "TIME_PERIOD_SHORT": A batch was sent with a time range that was too short. - "TIME_PERIOD_LONG": A batch was sent with a time range that was too long. - "ALREADY_UPDATED": An attempt was made to record a batch of data which was already seen. - "RECORD_RATE_HIGH": An attempt was made to record data faster than the server will apply updates.