`information_schema.metrics_tables.*`

show items implemented by

any at least two only one database all databases

relation	column	mysql	mariadb	tidb	postgres	cockroachdb	mssql
`metrics_tables`
	`comment`	unsupported	unsupported	`VARCHAR(256) NULL`: 4-6.1	unsupported	unsupported	unsupported
	`labels`	unsupported	unsupported	`VARCHAR(64) NULL`: 4-6.1	unsupported	unsupported	unsupported
	`promql`	unsupported	unsupported	`VARCHAR(64) NULL`: 4-6.1	unsupported	unsupported	unsupported
	`quantile`	unsupported	unsupported	`DOUBLE NULL`: 4-6.1	unsupported	unsupported	unsupported
	`table_name`	unsupported	unsupported	`VARCHAR(64) NULL`: 4-6.1	unsupported	unsupported	unsupported