Comprehensive and Detailed Explanation From Exact Extract:
The Universal Device Poller (UnDP) allows administrators to define custom SNMP OIDs for statistics (like UPS battery status) that are not natively polled. You can assign a new UnDP to an existing node to monitor additional values such as UPS battery status, provided the device supports the necessary OID.
Reference:
"Use the Universal Device Poller to assign additional custom statistics, such as UPS battery status, to any node that supports the relevant SNMP OID."
- (Network Performance Monitor Administrator Guide, Universal Device Poller section)

Comprehensive and Detailed Explanation From Exact Extract:
For a node-specific log view, navigate to the node's details summary and choose "Analyze Logs" under the Management section. This provides a filtered view of log messages for the selected node, allowing you to drill into relevant log events and details.
From the documentation:
"To view logs for a specific node, open Node Details > Management > Analyze Logs for node-level log analysis and troubleshooting." References:
Log Analyzer Administrator Guide: Viewing Node-Specific Logs

Device Studio pollers offer more advanced capabilities than traditional Universal Device Pollers (UDPs).
While both can poll SNMP-enabled devices, Device Studio pollers can gather additional node details (such as chassis information and advanced device metrics) that UDPs are not able to access. UDPs are limited to polling OIDs and displaying simple numeric or textual values. The official documentation states that Device Studio expands the range of supported technologies and provides access to more detailed device information compared to UDPs.
Reference:
Network Performance Monitor Administrator Guide, "Device Studio vs Universal Device Pollers - Capabilities Comparison"

Comprehensive and Detailed Explanation From Exact Extract:
Duplicate flow data typically results when both ingress and egress flow monitoring are applied simultaneously on interfaces. If both directions are enabled either globally (all interfaces) or locally (on a single interface), the same flow is counted twice-once entering and once leaving-resulting in duplicate statistics.
Reference:
"To avoid duplicate flow data, do not enable both ingress and egress NetFlow on the same interface or across all interfaces. Doing so will cause the same packets to be exported twice and counted as duplicates in reports and charts."
- (Network Performance Monitor Administrator Guide, NetFlow configuration best practices section)

Comprehensive and Detailed Explanation From Exact Extract:
If default SNMP polling is not returning data for a new device but works for others, it is likely that the device uses unique or vendor-specific MIBs not present in the SolarWinds MIB database. Updating the MIB database and building custom pollers (UDPs) for those MIBs allows you to collect the desired metrics. An SNMP walk may help you identify the OIDs, but building and assigning pollers is necessary for ongoing monitoring.
Reference:
Universal Device Poller Admin Guide, "Custom Pollers for Non-Standard Devices,"