This document describes Cloud Monitoring metrics and metadata, which you can view in a Network Topology visualization for each entity and connection.
- Metadata describes data such as name, description, and location.
- Metrics describe data such as traffic, latency, and packet loss, which are the supported metrics for connections.
For each Network Topology hierarchy, the Google Cloud Console displays a single metric for virtual machine (VM) instance entities and region entities, as well as for connections. You can change this default metric.
For steps describing how to work with metrics and metadata, see Using Network Topology.
Metrics for connections between entities
This section lists metrics for connections between entities.
Some connections support packet loss or latency metrics. Packet loss is based on probers that estimate the packet loss that you might experience, while latency and other metrics are based on your own traffic.
If there are not enough probes or traffic to calculate a high confidence value for packet loss or latency, Network Topology displays an asterisk (*) next to the value on the graph. For more information about how these metrics are calculated, see the Metrics section of the Performance Dashboard overview.
Connections in the VM hierarchy
This section lists metrics for connections in the aggregation hierarchy where VM is the base entity. For more information about entities and their aggregation hierarchies, see Resources and traffic.
|VM to VM1||
1 VM-to-VM flows are not available at all aggregation levels. For example, the VM-to-VM flow is not available, but the VM-to-region flow is available.
2 Packet loss is available only for regions and zones.
Client to load balancing
This section lists metrics and metadata for traffic from external or internal clients to different types of Cloud Load Balancing.
|Entity (node or edge)||Metrics|
|External client3 to HTTP(S) Load Balancing||
|External client to SSL Proxy Load Balancing or TCP Proxy Load Balancing||
|External client to Network Load Balancing||
3For external clients, Network Topology supports only
aggregation levels from
Country and higher.
Load balancing to backend instance groups
This section lists metrics and metadata from different types of Cloud Load Balancing to instance group backends.
|Entity or connection||Metrics|
|HTTP(S) Load Balancing to backend (instance group)||
|SSL Proxy Load Balancing or TCP Proxy Load Balancing to backend (instance group)||
|Internal TCP/UDP Load Balancing to backend (instance group)||
|Network Load Balancing to backend (instance group)||