Alert Metrics Reference

The following tables (arranged by alert tab, then by alert type) define the metrics available to those alert types as well as the metrics' operator functions and units.

The tables below include operators labelled "Dynamic (Classic)". These operators are being phased out as new alert rules are created and existing alert rules updated. However, all alert rules created before 17 September 2024 and still in use will show this operator as an option. Alert rules created after this date will only show "Dynamic" and "Static" options.

Cloud and Enterprise Agent Alerts

Alert Type: DNS Test Layer

Alert Subtype
Metric
Metric Definition
Operators
Units/Values

DNS Server

Error

What, if any, errors occurred when the test was running.

is present, matches, does not match

DNS Server

Resolution Time

The time it takes to query a specific named server for the given domain.

  • Dynamic (sensitivity)

  • Static (≥)

  • low, medium, high

  • ms

DNS Server

Mapping

The IP address a specified domain maps to. List can reflect IP addresses, CIDR blocks, or strings. Wildcards are supported for domains.

in, not in

DNS Trace

Error

What, if any, errors occurred when the test was running.

is present, matches, does not match

DNS Trace

Mapping

The IP address a specified domain maps to.

in, not in

DNSSEC

Error

What, if any, errors occurred when the test was running.

is present, matches, doesn't match

Alert Type: Network Test Layer

Alert Subtype
Metric
Metric Definition
Operators
Units/Values

Agent to Agent

Latency

The average of the round-trip packet time. Round-trip packet time is the time from which a packet is sent by the agent to the time the agent receives a reply.

  • Dynamic (sensitivity)

  • Static (≥)

  • low, medium, high

  • ms

Agent to Agent

Packet Loss

The percentage of packets lost is calculated by subtracting the number of reply packets the agent receives from the target (responses) from the number of packets sent by the agent, then dividing by the number of packets sent, then multiplying by 100.

≤, ≥

%

Agent to Agent

Jitter

The mean deviation of latency. The mean deviation represents how far, on average, all measurements are from the mean of the data.

  • Dynamic (sensitivity)

  • Static (≥)

  • low, medium, high

  • ms

Agent to Agent

Throughput

This is the Wire Size divided by the Receive Time.

kbps

Agent to Agent

Error

What, if any, errors occurred when the test was running.

is present, matches, doesn't match

Agent to Agent

DSCP

A Differentiated Services Code Point (DSCP) is a value found in an IP packet header which is used to request a level of priority for delivery (defined in RFC 2474)

is, is not

Best Effort (DSCP 0), CS 1 (DSCP 8), AF 11 (DSCP 10), AF 12 (DSCP 12), AF 13 (DSCP 14), CS 2 (DSCP 16), AF 21 (DSCP 18), AF 22 (DSCP 20), AF 23 (DSCP 22), CS 3 (DSCP 24), AF 31 (DSCP 26), AF 32 (DSCP 28), AF 33 (DSCP 30), CS 4 (DSCP 32), AF 41 (DSCP 34), AF 42 (DSCP 36), AF 43 (DSCP 38), CS 5 (DSCP 40), Voice Admit (DSCP 44), EF (DSCP 46), CS 6 (DSCP 48), CS 7 (DSCP 56)

Agent to Server

Error

What, if any, errors occurred when the test was running.

is present, matches, does not match

Agent to Server

Packet Loss

The percentage of packets lost is calculated by subtracting the number of reply packets the agent receives from the target (responses) from the number of packets. sent by the agent, then dividing by the number of packets sent, then multiplying by 100.

≤, ≥

%

Agent to Server

Latency

The average of the round-trip packet time. Round-trip packet time is the time from which a packet is sent by the agent to the time the agent receives a reply.

  • Dynamic (sensitivity)

  • Static (≥)

  • low, medium, high

  • ms

Agent to Server

Jitter

The mean deviation of latency. The mean deviation represents how far, on average, all measurements are from the mean of the data.

  • Dynamic (sensitivity)

  • Static (≥)

  • low, medium, high

  • ms

Agent to Server

Available Bandwidth

Total available bandwidth between source and destination measured in Mbps.

≤, ≥

Mbps

Agent to Server

Capacity

This represents an estimation of the link capacity in Mbps, also used to measure the available bandwidth as a subsequent step.

≤, ≥

Mbps

Agent to Server

Proxy Loss

The percentage of packets lost to the proxy.

≤, ≥

%

Agent to Server

Proxy Latency

The average of the round-trip time to the proxy. Round-trip packet time is the time from which a packet is sent by the agent to the time the agent receives a reply.

  • Dynamic (sensitivity)

  • Static (≥)

  • low, medium, high

  • ms

Agent to Server

Proxy Jitter

The mean deviation of proxy latency. The mean deviation represents how far, on average, all measurements are from the mean of the data.

  • Dynamic (sensitivity)

  • Static (≥)

  • low, medium, high

  • ms

Path Trace

Any Hop > Delay

Estimated minimum transmission delay across a given link. The value is calculated by finding the agent that reported the lowest response time for the node on the right-hand side of the link (the node further from the agent), then subtracting the same agent's lowest detected response time for the node on the left-hand side of the link (the node closer to the agent). When a single path trace from a single agent traverses the link, this metric is called Delay.

≤, ≥

ms

Path Trace

Any Hop > IP Address

An IP address is a unique address that identifies a device on the internet or a local network.

in, not in

Path Trace

Any Hop > ASN

Autonomous System Number assigned to a network prefix.

in, not in

Path Trace

Any Hop > rDNS

Reverse DNS (rDNS or RDNS) is a Domain Name Service (DNS) lookup of a domain name from an IP address.

in, not in

Path Trace

Any Hop > MPLS Label

Label associated with a given MultiProtocol Label Switching network.

in, not in

empty

Path Trace

Any Hop > DSCP

A Differentiated Services Code Point (DSCP) is a value found in an IP packet header which is used to request a level of priority for delivery (defined in RFC 2474)

is, is not

Best Effort (DSCP 0), CS 1 (DSCP 8), AF 11 (DSCP 10), AF 12 (DSCP 12), AF 13 (DSCP 14), CS 2 (DSCP 16), AF 21 (DSCP 18), AF 22 (DSCP 20), AF 23 (DSCP 22), CS 3 (DSCP 24), AF 31 (DSCP 26), AF 32 (DSCP 28), AF 33 (DSCP 30), CS 4 (DSCP 32), AF 41 (DSCP 34), AF 42 (DSCP 36), AF 43 (DSCP 38), CS 5 (DSCP 40), Voice Admit (DSCP 44), EF (DSCP 46), CS 6 (DSCP 48), CS 7 (DSCP 56)

Path Trace

No Hop > Delay

Estimated minimum transmission delay across a given link. The value is calculated by finding the agent that reported the lowest response time for the node on the right-hand side of the link (the node further from the agent), then subtracting the same agent's lowest detected response time for the node on the left-hand side of the link (the node closer to the agent). When a single path trace from a single agent traverses the link, this metric is called Delay.

≤, ≥

ms

Path Trace

No Hop > IP Address

An IP address is a unique address that identifies a device on the internet or a local network.

in, not in

Path Trace

No Hop > ASN

Autonomous System Number assigned to a network prefix.

in, not in

Path Trace

No Hop > rDNS

Reverse DNS (rDNS or RDNS) is a Domain Name Service (DNS) lookup of a domain name from an IP address.

in, not in

Path Trace

No Hop > MPLS Label

Label associated with a given MultiProtocol Label Switching network.

is, is not

empty

Path Trace

No Hop > DCSP

A Differentiated Services Code Point (DSCP) is a value found in an IP packet header which is used to request a level of priority for delivery. (defined in RFC 2474)

is, is not

Best Effort (DSCP 0), CS 1 (DSCP 8), AF 11 (DSCP 10), AF 12 (DSCP 12), AF 13 (DSCP 14), CS 2 (DSCP 16), AF 21 (DSCP 18), AF 22 (DSCP 20), AF 23 (DSCP 22), CS 3 (DSCP 24), AF 31 (DSCP 26), AF 32 (DSCP 28), AF 33 (DSCP 30), CS 4 (DSCP 32), AF 41 (DSCP 34), AF 42 (DSCP 36), AF 43 (DSCP 38), CS 5 (DSCP 40), Voice Admit (DSCP 44), EF (DSCP 46), CS 6 (DSCP 48), CS 7 (DSCP 56)

Path Trace

Hop # (source/destination) > Delay

Estimated minimum transmission delay across a given link. The value is calculated by finding the agent that reported the lowest response time for the node on the right-hand side of the link (the node further from the agent), then subtracting the same agent's lowest detected response time for the node on the left-hand side of the link (the node closer to the agent). When a single path trace from a single agent traverses the link, this metric is called Delay.

≤, ≥

ms

Path Trace

Hop # (source/destination) > IP Address

An IP address is a unique address that identifies a device on the internet or a local network.

in, not in

Path Trace

Hop # (source/destination) > ASN

Autonomous System Number assigned to a network prefix.

in, not in

Path Trace

Hop # (source/destination) > rDNS

Reverse DNS (rDNS or RDNS) is a Domain Name Service (DNS) lookup of a domain name from an IP address.

in, not in

Path Trace

Hop # (source/destination) > MPLS Label

Label associated with a given MultiProtocol Label Switching network.

is, is not

empty

Path Trace

Hop # (source/destination) > DSCP

A Differentiated Services Code Point (DSCP) is a value found in an IP packet header which is used to request a level of priority for delivery (defined in RFC 2474).

is, is not

Best Effort (DSCP 0), CS 1 (DSCP 8), AF 11 (DSCP 10), AF 12 (DSCP 12), AF 13 (DSCP 14), CS 2 (DSCP 16), AF 21 (DSCP 18), AF 22 (DSCP 20), AF 23 (DSCP 22), CS 3 (DSCP 24), AF 31 (DSCP 26), AF 32 (DSCP 28), AF 33 (DSCP 30), CS 4 (DSCP 32), AF 41 (DSCP 34), AF 42 (DSCP 36), AF 43 (DSCP 38), CS 5 (DSCP 40), Voice Admit (DSCP 44), EF (DSCP 46), CS 6 (DSCP 48), CS 7 (DSCP 56)

Path Trace

Last Hop > Delay

Estimated minimum transmission delay across a given link. The value is calculated by finding the agent that reported the lowest response time for the node on the right-hand side of the link (the node further from the agent), then subtracting the same agent's lowest detected response time for the node on the left-hand side of the link (the node closer to the agent). When a single path trace from a single agent traverses the link, this metric is called Delay.

≤, ≥

ms

Path Trace

Last Hop > IP Address

An IP address is a unique address that identifies a device on the internet or a local network.

in, not in

Path Trace

Last Hop > ASN

Autonomous System Number assigned to a network prefix.

in, not in

Path Trace

Last Hop > rDNS

Reverse DNS (rDNS or RDNS) is a Domain Name Service (DNS) lookup of a domain name from an IP address.

in, not in

Path Trace

Last Hop > MPLS Label

Label associated with a given MultiProtocol Label Switching network.

is, is not

empty

Path Trace

Last Hop > DSCP

A Differentiated Services Code Point (DSCP) is a value found in an IP packet header which is used to request a level of priority for delivery (defined in RFC 2474).

is, is not

Best Effort (DSCP 0), CS 1 (DSCP 8), AF 11 (DSCP 10), AF 12 (DSCP 12), AF 13 (DSCP 14), CS 2 (DSCP 16), AF 21 (DSCP 18), AF 22 (DSCP 20), AF 23 (DSCP 22), CS 3 (DSCP 24), AF 31 (DSCP 26), AF 32 (DSCP 28), AF 33 (DSCP 30), CS 4 (DSCP 32), AF 41 (DSCP 34), AF 42 (DSCP 36), AF 43 (DSCP 38), CS 5 (DSCP 40), Voice Admit (DSCP 44), EF (DSCP 46), CS 6 (DSCP 48), CS 7 (DSCP 56)

Path Trace

Target IP Address

The IP Address a given test is targeting as determined by the DNS lookup if the test does not specify a specific IP Address.

in, not in

Path Trace

Server MSS

Maximum Segment Size accepted by the server.

<, >

bytes

Path Trace

Path MTU

The maximum transmission unit (MTU) found on a given path.

<, >

bytes

Path Trace

Path Length

Total number of hops of the path from source to target.

<, >

hops

Path Trace

Trace is incomplete

Path does not reach its destination.

Alert Type: Voice Test Layer

Alert Subtype
Metric
Metric Definition
Operators
Units/Values

RTP Stream

Error

What, if any, errors occurred when the test was running.

is present, matches, does not match

RTP Stream

MOS

A number indicative of the perceived voice call quality.

≤, ≥

RTP Stream

Packet loss

The percentage of packets lost is calculated by subtracting the number of reply packets the agent receives from the target (responses) from the number of packets sent by the agent, then dividing by the number of packets sent, then multiplying by 100.

≤, ≥

%

RTP Stream

Discards

UDP packets arriving too late and thus discarded.

≤, ≥

%

RTP Stream

DSCP

A Differentiated Services Code Point (DSCP) is a value found in an IP packet header which is used to request a level of priority for delivery (defined in RFC 2474).

is, is not

Best Effort (DSCP 0), CS 1 (DSCP 8), AF 11 (DSCP 10), AF 12 (DSCP 12), AF 13 (DSCP 14), CS 2 (DSCP 16), AF 21 (DSCP 18), AF 22 (DSCP 20), AF 23 (DSCP 22), CS 3 (DSCP 24), AF 31 (DSCP 26), AF 32 (DSCP 28), AF 33 (DSCP 30), CS 4 (DSCP 32), AF 41 (DSCP 34), AF 42 (DSCP 36), AF 43 (DSCP 38), CS 5 (DSCP 40), Voice Admit (DSCP 44), EF (DSCP 46), CS 6 (DSCP 48), CS 7 (DSCP 56)

RTP Stream

Latency

The average of the round-trip packet time. Round-trip packet time is the time from which a packet is sent by the agent to the time the agent receives a reply.

  • Dynamic (sensitivity)

  • Static (≥)

  • low, medium, high

  • ms

RTP Stream

Packet Delay Variation

The average variation in unidirectional delay for packets reaching the destination.

  • Dynamic (sensitivity)

  • Static (≥)

  • low, medium, high

  • ms

SIP Server

Error Type

A string from list of valid error types.

is, is not

Any, None, DNS, Connect, Register, Options, Invite, Server

SIP Server

Response Code

The HTTP status code returned by the agent when fetching the URL.

is, is not

any error (≥ 400 or no response), OK (2xx), redirect (3xx), client error (4xx), server error (5xx), global error (6xx), custom code

SIP Server

DNS Time

The time required for the agent to perform a DNS resolution of the hostname in the URL.

  • Dynamic (sensitivity)

  • Static (≥)

  • low, medium, high

  • ms

SIP Server

Connect Time

The time required to establish a TCP connection with the web server.

  • Dynamic (sensitivity)

  • Static (≥)

  • low, medium, high

  • ms

SIP Server

Register Time

The time it takes to register with the SIP target

  • Dynamic (sensitivity)

  • Static (≥)

  • low, medium, high

  • ms

SIP Server

Options Time

The time required to negotiate what options will be used in the new connection

  • Dynamic (sensitivity)

  • Static (≥)

  • sensitivity

  • ms

SIP Server

Invite Time

How long the SIP invite handshake took.

  • Dynamic (sensitivity)

  • Static (≥)

  • low, medium, high

  • ms

SIP Server

Wait Time

The time elapsed between the completion of sending the HTTP request and the time the agent receives the first byte of the response from the web server.

  • Dynamic (sensitivity)

  • Static (≥)

  • low, medium, high

  • ms

SIP Server

Response Time

Also known as time-to-first-byte, this is the time from the beginning of the request (before DNS request) until the client receives the first byte of the response from the web server.

  • Dynamic (sensitivity)

  • Static (≥)

  • low, medium, high

  • ms

SIP Server

Total Time

Time to perform the test, including DNS, Connect (when using TCP protocol), Redirects (if any), Register and Options phases of the test.

  • Dynamic (sensitivity)

  • Static (≥)

  • low, medium, high

  • ms

Alert Type: Web Test Layer

Alert Subtype
Metric
Metric Definition
Operators
Units/Values

API

API Transaction Time

The total time taken by all of the API calls that run sequentially in an API test, averaged across each agent.

  • Dynamic (sensitivity)

  • Static (≥)

  • low, medium, high

  • ms

API

API Completion

A percentage value indicating the number of API calls that succeeded in the selected test round.