Dimension key. A valid dimension key includes only printable ASCII, excluding periods (.) and spaces. Custom dimension keys are acceptable. Avoid entering confidential information. Due to use by Connector Hub, the following dimension names are reserved: {@code connectorId}, {@code connectorName}, {@code connectorSourceType}. For information on valid dimension keys and values, see {@link #metricDataDetails(MetricDataDetailsRequest) metricDataDetails}. Example: {@code type}
A dimension name and value.