4 failing out of 2937

Entity	Check	State	Summary	Last State Change	Last Update	Last Notification
app4.nl1.triplexlets.com	dell_raid	CRITICAL	CheckRaid CRITICAL: Failed disk(s): . Online disk(s): a0e32s0 - ATA Samsung S...	13d 11h	15s	15s, problem
app5.nl1.triplexlets.com	keepalive	CRITICAL	No keepalive sent from client for 10453 seconds (>=180)	2h 51m	26s	26s, problem
matomomysql1.nyc3.y8.net	ram	WARNING	WARNING: memory usage is getting high - 91%	28m 25s	25s	25s, problem
monitor1.cz2.id.lan	disk	WARNING	CheckDisk WARNING: / 91%	15h 49m	1m 23s	1m 23s, problem