windows_exporter/internal/collector/nps/AGENTS.md

nps collector

The collector reads the single-instance PDH objects NPS Authentication Server and NPS Accounting Server with pdh.CounterTypeRaw. They exist only where the Network Policy Server role (service IAS) is installed. These notes were recorded on Windows Server 2025 (build 26100) with almost no RADIUS traffic.

• Every counter that the collector reads is PERF_COUNTER_RAWCOUNT. All of them except the two time counters are cumulative packet counts since the NPS service started.
• Server Up Time and Server Reset Time are elapsed times. The help text says "in hundredths of a second", but the raw value is seconds: 303 about 304 s after the IAS service started. Both objects report the same values.
• Each X / sec. twin (PERF_COUNTER_COUNTER, not read) has the same raw value as X (Packets Received / sec. 1 = Packets Received 1).
• No Record exists only on NPS Accounting Server; Access-Accepts/Challenges/Rejects/Requests only on NPS Authentication Server.

Counter reference

Recorded on Windows Server 2025 (build 26100). Raw and Base are the first and second values that pdh.CounterTypeRaw returns for the sample instance.

NPS Accounting Server

Single-instance.

Counters the collector reads:

Counter	Type	Raw	Base
Accounting-Requests	PERF_COUNTER_RAWCOUNT	1
Accounting-Responses	PERF_COUNTER_RAWCOUNT	1
Bad Authenticators	PERF_COUNTER_RAWCOUNT	0
Dropped Packets	PERF_COUNTER_RAWCOUNT	0
Invalid Requests	PERF_COUNTER_RAWCOUNT	0
Malformed Packets	PERF_COUNTER_RAWCOUNT	0
No Record	PERF_COUNTER_RAWCOUNT	0
Packets Received	PERF_COUNTER_RAWCOUNT	1
Packets Sent	PERF_COUNTER_RAWCOUNT	1
Server Reset Time	PERF_COUNTER_RAWCOUNT	3275
Server Up Time	PERF_COUNTER_RAWCOUNT	3275
Unknown Type	PERF_COUNTER_RAWCOUNT	0

Not read by the collector:

• PERF_COUNTER_COUNTER: Accounting-Requests / sec., Accounting-Responses / sec., Bad Authenticators / sec., Dropped Packets / sec., Invalid Requests / sec., Malformed Packets / sec., No Record / sec., Packets Received / sec., Packets Sent / sec., Unknown Type / sec.

NPS Authentication Server

Single-instance.

Counters the collector reads:

Counter	Type	Raw	Base
Access-Accepts	PERF_COUNTER_RAWCOUNT	0
Access-Challenges	PERF_COUNTER_RAWCOUNT	0
Access-Rejects	PERF_COUNTER_RAWCOUNT	0
Access-Requests	PERF_COUNTER_RAWCOUNT	0
Bad Authenticators	PERF_COUNTER_RAWCOUNT	0
Dropped Packets	PERF_COUNTER_RAWCOUNT	0
Invalid Requests	PERF_COUNTER_RAWCOUNT	0
Malformed Packets	PERF_COUNTER_RAWCOUNT	0
Packets Received	PERF_COUNTER_RAWCOUNT	0
Packets Sent	PERF_COUNTER_RAWCOUNT	0
Server Reset Time	PERF_COUNTER_RAWCOUNT	3275
Server Up Time	PERF_COUNTER_RAWCOUNT	3275
Unknown Type	PERF_COUNTER_RAWCOUNT	0

Not read by the collector:

• PERF_COUNTER_COUNTER: Access-Accepts / sec., Access-Challenges / sec., Access-Rejects / sec., Access-Requests / sec., Bad Authenticators / sec., Dropped Packets / sec., Invalid Requests / sec., Malformed Packets / sec., Packets Received / sec., Packets Sent / sec., Unknown Type / sec.