[Output Only] The status of the VPN tunnel, which can be one of the
following: - PROVISIONING: Resource is being allocated for the VPN
tunnel. - WAITING_FOR_FULL_CONFIG: Waiting to receive all
VPN-related configs from the user. Network, TargetVpnGateway,
VpnTunnel, ForwardingRule, and Route resources are needed to setup
the VPN tunnel. - FIRST_HANDSHAKE: Successful first handshake with
the peer VPN. - ESTABLISHED: Secure session is successfully
established with the peer VPN. - NETWORK_ERROR: Deprecated, replaced
by NO_INCOMING_PACKETS - AUTHORIZATION_ERROR: Auth error (for
example, bad shared secret). - NEGOTIATION_FAILURE: Handshake
failed. - DEPROVISIONING: Resources are being deallocated for the
VPN tunnel. - FAILED: Tunnel creation has failed and the tunnel is
not ready to be used. - NO_INCOMING_PACKETS: No incoming packets
from peer. - REJECTED: Tunnel configuration was rejected, can be
result of being denied access. - ALLOCATING_RESOURCES: Cloud VPN is
in the process of allocating all required resources. - STOPPED:
Tunnel is stopped due to its Forwarding Rules being deleted for
Classic VPN tunnels or the project is in frozen state. -
PEER_IDENTITY_MISMATCH: Peer identity does not match peer IP,
probably behind NAT. - TS_NARROWING_NOT_ALLOWED: Traffic selector
narrowing not allowed for an HA-VPN tunnel.