Common ITSI issues: KPIs showing "N/A" (base search errors), slow Glass Tables (too many widgets), KV Store failures (configuration disappears), and entity mismatches. The ITSI Health Check dashboard provides centralized diagnostics.
Key resources: itsi_kpi_summary.log for KPI problems, itsi_event_management.log for Notable Event issues, and "splunk show kvstore-status" for KV Store diagnostics. If services show "Unknown" health, check the KV Store first.