three mysql instances are monitored,but the buffer pool size of total ram has no data

Percona Monitoring and Management (PMM) PMM 1.x
1

[TABLE=“border: 0, cellpadding: 0, cellspacing: 0”]
[TR]
[TD]I monitored multiple mysql instances on one server:

		Pmm-admin add mysql --user PMM --password PMM --socket= XXX 1.1.1.1-3308

		Pmm-admin add mysql --user PMM --password PMM --socket= XXX 1.1.1.1-3309

		Pmm-admin add mysql --user PMM --password PMM --socket= XXX 1.1.1.1-3310

		And add Linux :metric

		PMM - admin add Linux: metric 1.1.1.1

		Now there is no data in the buffer pool size of total ram in the mysql overview of the monitoring interface. Does the mysql instance 1.1.1.1-3308 need to read the data of Linux :metric 1.1.1.1-3308? But what I added is the data of Linux :metric 1.1.1.1?

		I tried to add more Linux :metric X.X.X.X, but the system could only add one.How can you make buffer pool size of total ram of multiple instances display data normally[/TD]
	[/TR]

[/TABLE]