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Cumulus Docs Auto Merge
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content/cumulus-linux-517/Layer-1-and-Switch-Ports/Quality-of-Service/_index.md

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```
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### Lossless Headroom Based on Small Packet Probability
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<!--
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{{%notice note%}}
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Lossless headroom based on small packet probability is a Beta feature.
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{{%/notice%}}
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-->
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Cumulus Linux calculates the headroom size for lossless priority groups based on the assumption that all packets are small (64 bytes). The switch assumes a 100 percent probability of such packets arriving at line rate. As a result, the configured headroom is often larger than necessary, as traffic typically consists of a mix of packet sizes.
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<!--On Spectrum-6, the switch assumes a 50 percent probability of such packets arriving at line rate.-->
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content/cumulus-linux-517/Monitoring-and-Troubleshooting/Open-Telemetry-Export.md

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| Name | Description |
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|------ | ----------- |
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| `nvswitch_interface_link_debounce_ignored_events[event][interface]` | * UP: Events suppressed because debounce timer had not yet expired (transient UP spikes filtered). This metric indicates Noise or short UP spikes being filtered.<br>DOWN: Events suppressed because debounce timer had not yet expired (transient link loss filtered). This metric indicates short interruptions being filtered. |
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| `nvswitch_interface_link_debounce_received_events[event][interface]` | *UP: Events accepted and propagated after debounce delay (stable link recovery). This metric indicates stable link recovery events.<br>DOWN: Events accepted and propagated after debounce delay (sustained link failure). This metric indicates sustained link failure events. |
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| `nvswitch_interface_link_debounce_ignored_events[up-event][interface]` | *Events suppressed because debounce timer had not yet expired (transient UP spikes filtered). This metric indicates Noise or short UP spikes being filtered. |
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| `nvswitch_interface_link_debounce_ignored_events[down-event][interface]` | *Events suppressed because debounce timer had not yet expired (transient link loss filtered). This metric indicates short interruptions being filtered. |
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| `nvswitch_interface_link_debounce_received_events[up-event][interface]` | *Events accepted and propagated after debounce delay (stable link recovery). This metric indicates stable link recovery events. |
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| `nvswitch_interface_link_debounce_received_events[down-event][interface]` | *Events accepted and propagated after debounce delay (sustained link failure). This metric indicates sustained link failure events. |
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| `nvswitch_interface_link_debounce_timer_cancellations[interface]` | *Timer aborted because link state reverted before timer expired (quick reversal). This metric indicates Link flapping or oscillation. |
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| `nvswitch_interface_link_debounce_timer_expirations[interface]` | *Timer completed successfully, event sent after debounce delay (stable state change). This metric indicates Valid and stable state changes. |
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content/cumulus-linux-517/Whats-New/New-and-Updated-Telemetry-Metrics.md

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| Name | Description |
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|------ | ----------- |
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| `nvswitch_interface_link_debounce_ignored_events[event][interface]` | UP: Events suppressed because debounce timer had not yet expired (transient UP spikes filtered). This metric indicates Noise or short UP spikes being filtered.<br>DOWN: Events suppressed because debounce timer had not yet expired (transient link loss filtered). This metric indicates short interruptions being filtered. |
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| `nvswitch_interface_link_debounce_received_events[event][interface]` | UP: Events accepted and propagated after debounce delay (stable link recovery). This metric indicates stable link recovery events.<br>DOWN: Events accepted and propagated after debounce delay (sustained link failure). This metric indicates sustained link failure events. |
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| `nvswitch_interface_link_debounce_ignored_events[up-event][interface]` | Events suppressed because the debounce timer had not yet expired (transient UP spikes filtered). This metric indicates Noise or short UP spikes being filtered.|
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| `nvswitch_interface_link_debounce_ignored_events[down-event][interface]` | Events suppressed because the debounce timer had not yet expired (transient link loss filtered). This metric indicates short interruptions being filtered. |
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| `nvswitch_interface_link_debounce_received_events[up-event][interface]` | Events accepted and propagated after debounce delay (stable link recovery). This metric indicates stable link recovery events. |
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| `nvswitch_interface_link_debounce_received_events[down-event][interface]` | Events accepted and propagated after debounce delay (sustained link failure). This metric indicates sustained link failure events. |
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| `nvswitch_interface_link_debounce_timer_cancellations[interface]` | Timer aborted because link state reverted before timer expired (quick reversal). This metric indicates Link flapping or oscillation. |
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| `nvswitch_interface_link_debounce_timer_expirations[interface]` | Timer completed successfully, event sent after debounce delay (stable state change). This metric indicates Valid and stable state changes. |
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content/cumulus-linux-517/Whats-New/_index.md

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- {{<link url="Quality-of-Service/#lossless-shared-headroom-pool" text="Lossless shared headroom pool">}}
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- {{<link url="Link-Layer-Discovery-Protocol/#lldp-tlvs" text="Granular LLDP TLV definition and control">}}
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- {{<link url="Syslog/#thermal-control-logs" text="Thermal logging in syslog (sensor and fan state and errors)">}}
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- {{<link url="Quality-of-Service/#lossless-headroom-based-on-small-packet-probability" text="Lossless headroom size based on small packet probability">}} (Beta)
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- {{<link url="Quality-of-Service/#lossless-headroom-based-on-small-packet-probability" text="Lossless headroom size based on small packet probability">}}
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- {{<link url="Quality-of-Service/#dynamic-ecn" text="Dynamic ECN">}} (Beta)
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- {{<link url="Optional-BGP-Configuration/#bgp-lldp-unreachability-in-disjoined-planes" text="BGP-LLDP Unreachability in Disjoined Planes">}} and {{<link url="EVPN-Enhancements/#evpn-unreachability-in-disjoined-planes" text="EVPN Unreachability in Disjoined Planes">}} (Beta)
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- {{<link url="Link-Layer-Discovery-Protocol/#bgp-unreachable-prefix-tlv" text="BGP unreachable prefix TLV">}} (Beta)

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