GCP Proxy Network Load Balancers

Google Cloud Platform (GCP) Proxy Network Load Balancers are Layer 4 reverse proxy load balancers that distribute TCP traffic to backends in your Google Cloud Virtual Private Cloud network or in other cloud environments.

Cisco Cloud Observability supports monitoring:

Internal Proxy Network Load Balancer
External Proxy Network Load Balancer

You must configure cloud connections to monitor this entity. See Configure Google Cloud Platform Connection.

Cisco Cloud Observability displays GCP entities on the Observe page. Metrics are displayed for specific entity instances in the list and detail views.

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Detail View

To display the detail view of a Proxy Network Load Balancer instance:

Navigate to the Observe page.
Under Networking & App Delivery, click Load Balancers.
The Load Balancers list view now displays.
Click the GCP tab to display only GCP load balancers. You can use the Type column header to sort the list by the type of GCP load balancer.
From the list, click a load balancer Name to display the detail view.
The detail view displays metrics, key performance indicators, and properties (attributes) related to the instance you selected.

Metrics and Key Performance Indicators

Cisco Cloud Observability displays the following metrics and key performance indicators (KPIs) for GCP Proxy Network Load Balancer. See Google Cloud metrics.

Some GCP metrics have been modified in Cisco Cloud Observability. Metric display names and descriptions may differ from the source metric.

Display Name	Source Metric Name	Description
Network Throughput (By)	`l4_proxy/egress_bytes_count` `l4_proxy/ingress_bytes_count`	The number of bytes sent from the backend of the external network load balancer to the client. For TCP flows, this metric counts the bytes on the application stream only.
Closed Connections	`l4_proxy/tcp/closed_connections_count`	Number of connections that were terminated over TCP proxy or SSL proxy load balancer.

Display Name	Source Metric Name	Description
Network Throughput (By)	`tcp_ssl_proxy/egress_bytes_count` `tcp_ssl_proxy/ingress_bytes_count`	The number of bytes sent from the backend of the external network load balancer to the client. For TCP flows, this metric counts the bytes on the application stream only.
Closed/New Connections	`tcp_ssl_proxy/closed_connections` `tcp_ssl_proxy/new_connections`	Number of connections that were created/terminated over TCP proxy or SSL proxy load balancer.
Open Connections	`tcp_ssl_proxy/open_connections`	Current number of outstanding connections through the TCP proxy or SSL proxy load balancer.
Frontend TCP RTT (ms)	`tcp_ssl_proxy/frontend_tcp_rtt`	A distribution of the smoothed RTT (in ms) measured by the proxy's TCP stack, each minute that application layer bytes pass from the proxy to client.

Properties (Attributes)

Cisco Cloud Observability displays the following properties for GCP Proxy Network Load Balancer.

Display Name	Source Property Name	Description
Region	`region`	The region under which the backend service is defined.
Provider	-	The `gcp` string, hardcoded.
Account ID	-	The ID of the GCP project.
Platform	-	The `gcp_load_balancer` string, hardcoded.
ID	-	The ID of the load balancer.
Name	-	The name of the load balancer.
Type	-	The type of the load balancer.

Retention and Purge Time-To-Live (TTL)

For all cloud and infrastructure entities, the retention TTL is 180 minutes (3 hours) and the purge TTL is 525,600 minutes (365 days).

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