managed system's Database Exceptions and Database Performance in Gray

Dear Friends,

Currently, we are using Solman7.1 SP8 monitoring systems, but all the managed system's Database Exceptions and Database Performance are all in Gray

Could you please advise what could be the cause and where can i see the log?

Landscape for your reference:

Solution Manager:

1. solman7.1 SP8.

2. System Preparation and Basis Configuration completed in Green

3.

ST-A/PI 01Q_700 0001 SAPKITAB7K

ST-PI 2008_1_700 0008 SAPKITLRD8

Managed system, ABAP+JAVA:

1. in Managed system, the ABAP stack: RFC status, Auto. Conf. Status, Plug-in Status, System Status are all in Green.  No update needed.

2.

      SAPOSCOL version  COLL 22.10 720 - v2.27, AMD/Intel x86_64 with Linux, 2013-08-06, 64 bit, single threaded, Non-Unicode

      compiled at   Nov 16 2013

      systemid      390 (AMD/Intel x86_64 with Linux)

      relno         7200

      patch text    COLL 22.10 720 - v2.27, AMD/Intel x86_64 with Linux, 2013-08-06

      patchno       518

      intno         20020600

3. Diagnostics Agent:  720, Patch 117, changelist 1295245

What kind of data gathered by Diagnostics Agent?  Where is the log.

I would like to fix the Gray issue asap.

Thanks for your support.

Dong Zhou