mirror of
https://github.com/prometheus-community/windows_exporter.git
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Jan-Otto Kröpke
d6afd48819
WindowsHostRebooted compares against the last boot time of the previous hour instead of the sample of ten minutes ago, so a scrape gap during the reboot no longer suppresses the alert. WindowsServiceNotRunning joins with ignoring() so instances with the same name in different clusters do not match each other. Replacing the removed networkErrorRateThreshold or networkDiscardRateThreshold knobs now fails with a message naming the ratio thresholds. The network error and discard runbooks describe the packet ratio, the service runbooks explain PID reuse, shared host processes and selector exclusions, and the tests cover alert recovery, a reboot after a scrape gap and a service name repeated across clusters. Signed-off-by: Jan-Otto Kröpke <mail@jkroepke.de>
51 lines
2.1 KiB
Markdown
51 lines
2.1 KiB
Markdown
---
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title: WindowsNetworkErrors
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---
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## Meaning
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Packets with inbound or outbound errors make up more than the configured share
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of all packets on an interface for 15 minutes. The default
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`networkErrorRatioThreshold` is 1 percent. The ratio divides the error rates
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(`windows:net_received_errors:rate` plus `windows:net_outbound_errors:rate`) by
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the packet rates (`windows:net_received_packets:rate` plus
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`windows:net_sent_packets:rate`), so a quiet interface with a handful of errors
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alerts while a busy interface with the same error count does not. Interfaces
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that carry no packets produce no sample and cannot alert. The alert identifies
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the interface using its `nic` label and keeps firing for `keepFiringFor` after
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the ratio drops below the threshold.
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## Impact
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Packet errors may cause retransmissions, lower throughput, and intermittent
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connection failures.
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## Diagnosis
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1. Inspect `windows:net_received_errors:rate` and
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`windows:net_outbound_errors:rate` separately to identify the direction, and
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compare them with `windows:net_received_packets:rate` and
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`windows:net_sent_packets:rate` to see whether a low packet rate inflates the
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ratio.
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2. Compare traffic and `windows:net_received_utilization:ratio` and
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`windows:net_sent_utilization:ratio` with the normal baseline. These ratios
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use bandwidth in bytes per second and keep each direction separate.
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3. Inspect local adapter state and counters:
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```powershell
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Get-NetAdapter
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Get-NetAdapterStatistics
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```
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4. Inspect switch-port counters, cabling, link negotiation, NIC drivers, and
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System event logs. For virtual NICs, inspect the host and virtual switch.
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## Mitigation
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Repair faulty links or switch ports and correct driver or adapter configuration
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problems. Apply driver and firmware fixes through the normal change process.
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Relieve congestion if it contributes. Verify errors stop increasing and affected
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application connections recover; cumulative counters do not need to return to
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zero for the ratio alert to resolve. Raise `networkErrorRatioThreshold` only for
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interfaces whose error share is known and accepted.
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