It refers to a data record.
It is used to store data. It contains multiple data records, and one data record contains multiple columns.
It describes the system or device and supports filtering and aggregate operations. It is similar to a column in a relational database.
It records the system or device status and supports the aggregate operation. It is similar to a column in a relational database.
It is the configuration information for metric creation, including common settings such as data expiration time, number of metric shards, and number of replicas.
It records the data occurrence time.