gcpdiag/runbook/nat/templates/nat_out_of_resources.jinja

  #############################################################
  #          Messages for NAT IP Exhaustion Check             #
  #############################################################

  {% block nat_ip_exhaustion_check_success_reason %}
   No IP exhaustion issues found on the NAT GW {nat_gateway_name}
  {% endblock nat_ip_exhaustion_check_success_reason %}

  {% block nat_ip_exhaustion_check_failure_reason %}
   NAT IP allocation failure found on the NAT GW {nat_gateway_name}
  {% endblock nat_ip_exhaustion_check_failure_reason %}

  {% block nat_ip_exhaustion_check_failure_remediation %}
   IP exhaustion issues on {nat_gateway_name} can be remediated by taking the following steps in [1]:
   [1] <https://cloud.google.com/knowledge/kb/cloud-nat-is-dropping-or-limiting-egress-connectivity-000004263#:~:text=If%20the%20metric%20indicates%20that,on%20the%20Port%20reservation%20procedure>
  {% endblock nat_ip_exhaustion_check_failure_remediation %}

  #############################################################
  #          Messages for Resource Exhaustion Check           #
  #############################################################

  {% block nat_resource_exhaustion_check_success_reason %}
   No {metric_reason} issues on the dropped_sent_packet metric for the NAT GW {nat_gateway_name} seen.
  {% endblock nat_resource_exhaustion_check_success_reason %}

  {% block nat_resource_exhaustion_check_failure_reason %}
   {metric_reason} issue found on the dropped_sent_packet metric on the NAT GW {nat_gateway_name}
  {% endblock nat_resource_exhaustion_check_failure_reason %}

  {% block nat_resource_exhaustion_check_failure_remediation %}
   Resource exhaustion issues can be remediated by taking the following steps in [1]:
   [1] <https://cloud.google.com/knowledge/kb/cloud-nat-is-dropping-or-limiting-egress-connectivity-000004263#:~:text=If%20the%20metric%20indicates%20that,on%20the%20Port%20reservation%20procedure>
  {% endblock nat_resource_exhaustion_check_failure_remediation %}

  #############################################################
  #          Messages for NAT received packet drop check      #
  #############################################################

  {% block nat_dropped_received_packet_check_success_reason %}
   No received_packet_drop on NAT GW {nat_gateway_name} seen.
  {% endblock nat_dropped_received_packet_check_success_reason %}

  {% block nat_dropped_received_packet_check_uncertain_reason %}
   Elevated received_packet_drop_count metric noticed for NAT GW {nat_gateway_name}
   dropped_received_packet: {metric_value}
  {% endblock nat_dropped_received_packet_check_uncertain_reason %}

  {% block nat_dropped_received_packet_check_uncertain_remediation %}
   NAT gateways could be dropping packets for various reasons; however, the drops are not always indicative of an issue.
   Checking received_packet_drop metrics at the VM level as well. Open a case to GCP Support for confirmation
   of the reason for the drops
   See more on troubleshooting cloud NAT reducing the drops here [1] and [2]:
   [1] <https://cloud.google.com/nat/docs/troubleshooting>
   [2] <https://cloud.google.com/knowledge/kb/reduce-received-packets-dropped-count-on-cloud-nat-000006744>
  {% endblock nat_dropped_received_packet_check_uncertain_remediation %}

  #############################################################
  #          Messages for VM received packet drop check       #
  #############################################################

  {% block vm_dropped_received_packet_check_success_reason %}
   No received_packet_drop on NAT GW {nat_gateway_name} seen.
  {% endblock vm_dropped_received_packet_check_success_reason %}

  {% block vm_dropped_received_packet_check_uncertain_reason %}
   Elevated received_packet_drop_count metric noticed for following VMs
   {vm_drop_list}
  {% endblock vm_dropped_received_packet_check_uncertain_reason %}

  {% block vm_dropped_received_packet_check_uncertain_remediation %}
   VMs could be dropping packets for various reasons; however, the drops are not always indicative of an issue.
   See more on troubleshooting cloud NAT and reducing the drops here [1] and [2]:
   Open a case to GCP Support for justification for the packet drops.
   [1] <https://cloud.google.com/nat/docs/troubleshooting>
   [2] <https://cloud.google.com/knowledge/kb/reduce-received-packets-dropped-count-on-cloud-nat-000006744>
  {% endblock vm_dropped_received_packet_check_uncertain_remediation %}