What's changed: Created Professional Cloud Network Engineer Chapter 5 (Domain 5 "Operations": logging network components (VPN/Router/VPC SC/Cloud NGFW/Firewall Insights/VPC Flow Logs/Cloud DNS/Cloud NAT/NCC) with Google Cloud Observability, networking metrics monitoring, Application Load Balancer connection draining/traffic redirect, VPN/Interconnect/Cloud Router BGP troubleshooting, VPC Flow Logs/firewall logs/Packet Mirroring, Network Intelligence Center = Network Topology/Connectivity Tests/Performance Dashboard/Firewall Insights/Network Analyzer/Flow Analyzer).
5.1Logging/monitoring and connectivity troubleshooting
Understand logging of network components with Google Cloud Observability (Cloud VPN/Cloud Router/VPC Service Controls/Cloud NGFW/Firewall Insights/VPC Flow Logs/Cloud DNS/Cloud NAT/Network Connectivity Center), monitoring networking metrics, draining/redirecting traffic with the Application Load Balancer, troubleshooting VPN/Interconnect/Cloud Router BGP, and investigating with VPC Flow Logs/firewall logs/Packet Mirroring.
A production network depends on visibility. Capture logs and metrics for each component, and during incidents triage quickly with the right data.
5.1.1Logging and metrics monitoring
Use Google Cloud Observability (formerly Operations) to enable and review logs for each network component: Cloud VPN, Cloud Router, VPC Service Controls, Cloud NGFW, Firewall Insights, VPC Flow Logs, Cloud DNS, Cloud NAT, Network Connectivity Center, and more. VPC Flow Logs record samples of VM-to-VM/external traffic for investigation and billing analysis. With metrics, monitor the state of Cloud VPN/Interconnect, VLAN attachments, Cloud Router, load balancers, Google Cloud Armor, and Cloud NAT (tunnel up, BGP session, throughput, drops) and alert on thresholds. Map "record of who talked to what = VPC Flow Logs" and "monitor tunnel/BGP health = VPN/Router metrics."
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