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 Google Cloud
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Load balancer
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https://cloud.google.com/load-balancing/docs/https/traffic-management
  Traffic management overview for external HTTP(S) load balancers.
https://cloud.google.com/compute/docs/reference/rest/v1/urlMaps
  URL map API.

Health check
============

List health checks::

  gcloud compute health-checks list --format=yaml

In order for LB to function you need to define health checks. They run outside of intranet so
firewall rules have to be applied to VMs for checks to succeed::

  gcloud compute firewall-rules create fw-allow-health-check \
    --network=default \
    --action=allow \
    --direction=ingress \
    --source-ranges=130.211.0.0/22,35.191.0.0/16 \
    --target-tags=allow-health-check \
    --rules=tcp:80

https://cloud.google.com/load-balancing/docs/health-checks
  Creating health checks & magical subnets for FW rules.