How to work around OMS 12.1.0.3 error: Metric evaluation error start – Get dynamic property error

• EM 12c: Enterprise Manager 12.1.0.3 Cloud Control Metric Collection Error: Metric Evaluation – Error Start – Dynamic Category Property Error (Doc ID 1594696.1)
• EM 12c: Targets Are Showing Pending Status After Discovery (Doc ID 1617162.1)
• Database instance target status at ‘Metric Collection Error’ in Enterprise Manager Cloud Control 12.1.0.2 (Doc ID 1519711.1)

 Host=dbserver.domain.com
  Target type=Cluster Database
  Target name=proddb
  Categories=Availability
  Message=Metric evaluation error start - Get dynamic property error,Dynamic Category property error,Computation of a critical dynamic property failed. Retries Completed.
  Severity=Critical
  Event reported time=Aug 9, 2019 1:26:29 PM PST
  Target Lifecycle Status=Production
  Line of Business=Exadata
  Location=MyDC
  Operating System=Linux
  Platform=x86_64
  Associated Incident Id=65566
  Associated Incident Status=New
  Associated Incident Owner= 
  Associated Incident Acknowledged By Owner=No
  Associated Incident Priority=None
  Associated Incident Escalation Level=0
  Event Type=Target Availability
  Event name=Status
  Availability status=Availability Evaluation Error
  Rule Name=******
  Rule Owner=SYSMAN
 

[oracle@dbserver ~]$ emctl stop agent
 Oracle Enterprise Manager Cloud Control 12c Release 3 
 Copyright (c) 1996, 2013 Oracle Corporation. All rights reserved.
 Stopping agent ..... stopped.
 [oracle@dbserver ~]$ emctl clearstate agent
 Oracle Enterprise Manager Cloud Control 12c Release 3 
 Copyright (c) 1996, 2013 Oracle Corporation. All rights reserved.
 EMD clearstate completed successfully
 [oracle@dbserver ~]$ emctl start agent
 Oracle Enterprise Manager Cloud Control 12c Release 3 
 Copyright (c) 1996, 2013 Oracle Corporation. All rights reserved.
 Starting agent ................. started.
 [oracle@dbserver ~]$ emctl upload agent
 Oracle Enterprise Manager Cloud Control 12c Release 3 
 Copyright (c) 1996, 2013 Oracle Corporation. All rights reserved.
 ---------------------------------------------------------------
 EMD upload completed successfully
 [oracle@dbserver ~]$ emctl config agent listtargets
 Oracle Enterprise Manager Cloud Control 12c Release 3 
 Copyright (c) 1996, 2013 Oracle Corporation. All rights reserved.
 [dbserver.domain.com, host]
 [dbserver.domain.com:3872, oracle_emd]
 [dbserver-ilom.domain.com, oracle_exa_ilom]
 [dbserver-ilom.domain.com, oracle_exa_ilom]
 [dbserver-pdub.domain.com, oracle_exa_pdu]
 [dbserver-pdua0.domain.com, oracle_exa_pdu]
 [dbserver.domain.com, oracle_exadata]
 [dbserver.domain.com, oracle_exadata]
 [dbserver.domain.com, oracle_exadata]
 [dbserver.domain.com, oracle_exadata]
 [Ora11g_gridinfrahome2_1_dbserver, oracle_home]
 [dbserver-ibb0.domain.com, oracle_ibswitch]
 [dbserver-ibs0.domain.com, oracle_ibswitch]
 [agent12c1_4_dbserver, oracle_home]
 [oraproddb_Home_2_dbserver, oracle_home]
 [oraentsp_Home_3_dbserver, oracle_home]
 [LISTENER_dbserver.domain.com, oracle_listener]
 [+ASM3_dbserver.domain.com, osm_instance]
 [has_dbserver.domain.com, has]
 [proddb_proddb1, oracle_database]
 [proddb, rac_database]
 [dbserver-cluster, cluster]
 [LISTENER_SCAN2_dbserver-cluster, oracle_listener]
 [proddb_proddb1, oracle_database]
 [proddb, rac_database]
 [oracle@dbserver ~]$ emctl reload agent dynamicproperties proddb:rac_database
 Oracle Enterprise Manager Cloud Control 12c Release 3 
 Copyright (c) 1996, 2013 Oracle Corporation. All rights reserved.
 ---------------------------------------------------------------
 EMD recompute dynprops completed successfully
 [oracle@dbserver ~]$