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Observability User Guide

6.3.1. Metrics for advanced analysis

The Level 3 and Level 4 Troubleshooting dashboards provide advanced, targeted analysis for diagnosing performance issues related to specific endpoints. Use the selector in the dashboard title to choose a metric group. Your selection controls the metrics shown in both the line chart and the table. You can change the selection at any time to explore different aspects of your network performance. When the dashboard is loading data, a blue progress bar appears above the chart and table. Wait for the bar to disappear before reviewing metrics. Scroll across the table to see all available data.

metric_group_selector.png

Metrics are systematically organized into groups to facilitate the identification and resolution of various observed issues. The following table details the available metrics for each group: Default, Memory (ZWins), Sessions and Connections, Retransmissions, Gaps and Duplicates, Connection Errors, and All Metrics.

Table 1. Level 3 and 4 metrics

Metric

Default

Memory (ZWins)

Sessions and Connections

Retransmissions

Gaps and Duplicates

Connection Failures

All Metrics

Bytes Rx

Y

Y

Y

Y

Y

Y

Y

Bytes Tx

Y

Y

Y

Y

Y

Y

Y

Client latency

Y

Y

Y

Y

Y

N

Y

Duplicates Rx

N

N

N

N

Y

N

Y

Duplicates Tx

N

N

N

N

Y

N

Y

Failure % - inbound connections

N

N

N

N

N

Y

Y

Failure % - outbound connections

N

N

N

N

N

Y

Y

FINs Rx

N

N

N

N

N

Y

Y

FINs Tx

N

N

N

N

N

Y

Y

Gaps Rx

N

N

N

N

Y

N

Y

Gaps Tx

N

N

N

N

Y

N

Y

Inbound connections

N

N

Y

N

N

Y

Y

Inbound max active sessions

N

N

Y

N

N

N

Y

Inbound zero bytes sessions

N

N

N

N

N

Y

Y

Max flows Rx

Y

Y

Y

Y

Y

Y

Y

Max flows Tx

Y

Y

Y

Y

Y

Y

Y

Missing SYNs Rx

N

N

Y

N

N

Y

Y

Missing SYNs Tx

N

N

Y

N

N

Y

Y

Network latency

N

N

Y

Y

Y

N

Y

Outbound connections

N

N

Y

N

N

Y

Y

Outbound max active sessions

N

N

Y

N

N

N

Y

Outbound zero bytes sessions

N

N

N

N

N

Y

Y

Packets Rx

Y

Y

Y

Y

Y

Y

Y

Packets Tx

Y

Y

Y

Y

Y

Y

Y

Peer client latency

N

N

Y

Y

Y

N

Y

Peer network latency

N

N

Y

Y

Y

N

Y

Peer server latency

N

N

Y

Y

Y

N

Y

Resets Rx

N

N

N

N

N

Y

Y

Resets Tx

N

N

N

N

N

Y

Y

Retransmissions Rx

N

N

N

Y

Y

N

Y

Retransmissions Tx

N

N

N

Y

Y

N

Y

Server latency

Y

Y

Y

Y

Y

N

Y

SYN failures Rx

N

N

Y

N

N

Y

Y

SYN failures Tx

N

N

Y

N

N

Y

Y

SYNs Rx

N

N

Y

N

N

Y

Y

SYNs Tx

N

N

Y

N

N

Y

Y

SYNACKs Rx

N

N

Y

N

N

Y

Y

SYNACKs Tx

N

N

Y

N

N

Y

Y

Throughput Rx

Y

Y

Y

Y

Y

Y

Y

Throughput Tx

Y

Y

Y

Y

Y

Y

Y

ZWins Rx

N

Y

Y

N

N

N

Y

ZWins Tx

N

Y

Y

N

N

N

Y



In this section:

The total number of bytes an endpoint or application received.

The total number of bytes an endpoint or application transmitted.

Client latency is the round-trip time between the server sending a TCP packet and the client acknowledging the packet as observed by the monitoring point.

The number of packets received by an endpoint with the same sequence number as a previously received packet.

The number of packets transmitted by an endpoint with the same sequence number as a previously transmitted packet.

The percentage of inbound connection attempts that failed to complete a three-way TCP handshake (SYN-SYNACK-ACK) where the host is a server.

The percentage of outbound connection attempts that failed to complete a three-way TCP handshake (SYN-SYNACK-ACK) where the host is a client.

The total number of FIN packets received for the specific endpoint or application.

The total number of FIN packets transmitted for the specific endpoint or application.

The number of missing packets with gaps in the TCP sequence numbers that are observed between two consecutive packets received by an endpoint.

The number of missing packets with gaps in the TCP sequence numbers that are observed between two consecutive packets transmitted by an endpoint.

The total number of inbound connections that have successfully completed a three-way TCP handshake (SYN-SYNACK-ACK) where the host is a server.

The maximum number of TCP sessions that are currently open where the host is a server.

A session where the host, acting as a server, does not successfully receive any data. A connection was established, but no data transfer occurred during the session.

The maximum number of received flows by a host as observed by a monitoring point.

The maximum number of transmitted flows by a host as observed by a monitoring point.

The number of SYNACK packets received by the endpoint where the corresponding initial SYN packet is missing or not detected.

The number of SYN packets transmitted by the endpoint where the corresponding SYNACK packet is not received.

Network latency is the response time as measured between the client’s initial connection request (SYN packet) and the server’s response (SYN-ACK packet), as observed by the monitoring point.

The total number of outbound connections that have successfully completed a three-way TCP handshake (SYN-SYNACK-ACK) where the host is a client.

The maximum number of TCP sessions that are currently open where the host is a client.

A session where the host, acting as a client, does not successfully transmit any data. A connection was established, but no data transfer occurred during the session.

The total number of packets an endpoint or application received.

The total number of packets an endpoint or application transmitted.

Peer client latency is the round trip time between the server sending a TCP packet and the client acknowledging the packet as observed by the monitoring point.

Peer network latency is the response time as measured between the client’s initial connection request (SYN packet) and the peer server’s response (SYN-ACK packet) as observed by the monitoring point.

Peer server latency is the round-trip time between the client sending a TCP packet and the peer server acknowledging the packet as observed by the monitoring point.

The number of reset (RST) packets received for the specific endpoint or application.

The number of reset (RST) packets transmitted for the specific endpoint or application.

The total number of packets received with a lower than expected sequence number, indicating the packet is a retransmission of a previously sent packet.

The total number of packets transmitted with a lower than expected sequence number, indicating the packet is a retransmission of a previously sent packet.

Server latency is the round-trip time between the client sending a TCP packet and the server acknowledging the packet, as observed by the monitoring point.

The number of attempted connections to the endpoint that failed to complete the three-way TCP handshake (SYN-SYNACK-ACK).

The number of connections the endpoint attempted to establish that failed to complete the three-way TCP handshake (SYN-SYNACK-ACK).

The total number of SYN packets received for the specific endpoint or application where the host is a server.

The total number of SYN packets transmitted for the specific endpoint or application where the host is a client.

The total number of SYN-ACK packets received for the specific endpoint or application where the host is a client.

The total number of SYN-ACK packets transmitted for the specific endpoint or application where the host is a server.

The total data in bits per second received by the endpoint or application calculated over the resolution of the dashboard.

The total data in bits per second transmitted by the endpoint or application calculated over the resolution of the dashboard.

The number of TCP packets the host has received with a window size of zero from the peer. This indicates that the peer has reached its maximum capacity and cannot process more incoming data. This is a signal for the host to pause or stop sending data until the peer has sufficient memory or resources to process the incoming data.

The number of TCP packets the host has transmitted with a window size of zero. This indicates the host has reached its maximum capacity and cannot process more incoming data. This is a signal for the peer to pause or stop sending data until the host has sufficient memory or resources to process the incoming data.