Check: Metric values are reported by IS Agent

Steps

Access Alerting Directory Browser: [http://solman_host:solman_port/sap/bc/webdynpro/sap/wda_ac_dir_browser?sap-language=EN
Select Managed Object on the left menu
Select tab Metrics
Select metric to troubleshoot in the list
Select tab Data Collection
Check that metric is reported by IS Host Agent (parameter IS_AGENT_NAME)
Write down parameters COLL_HOSTS and IS_PATH
Access Introscope Investigator (Work Station or WebView)
Expand node <server name> (see parameter COLL_HOSTS above)
Expand node SAP HostAgent Process
Expand node SAP HostAgent <?>, where <?> is Diagnostics Agent's Instance Id
Expand node IS_PATH writed down previously
Check that metric values are reported in the graph view on the right side

Solution Manager Setup -> Managed System Configuration -> ConfigureSystem -> Configure Automatically -> Introscope Host Adapter

Diagnostics Agent logs: /usr/sap/DAA/SMDA<??>/SMDAgent/log/SMDAgentApplication.*.log