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
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
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
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
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.