service_checks_metrics.erb

# A template for exporting metrics for prometheus using consul-templaterb
# This template can be configure the following way with environment variables
# Environment variables to filter services/instances
#   SERVICES_TAG_FILTER: basic tag filter for service (default HTTP)
#   INSTANCE_MUST_TAG: Second level of filtering (optional, default to SERVICES_TAG_FILTER)
#   INSTANCE_EXCLUDE_TAG: Exclude instances having the given tag
#   EXCLUDE_SERVICES: comma-separated services regexps to exclude (example: lbl7.*,netsvc-probe.*,consul-probed.*)


# HELP consul_service_check_count The number of service check for each service
# TYPE consul_service_check_count gauge
# HELP consul_node_check_count The number of node check for each service
# TYPE consul_node_check_count gauge

<%
  service_tag_filter = ENV['SERVICES_TAG_FILTER'] || nil
  instance_must_tag = ENV['INSTANCE_MUST_TAG'] || service_tag_filter
  instance_exclude_tag = ENV['INSTANCE_EXCLUDE_TAG']

  # Services to hide
  services_blacklist_raw = (ENV['EXCLUDE_SERVICES'] || 'lbl7.*,netsvc-probe.*,consul-probed.*').split(',')
  services_blacklist = services_blacklist_raw.map { |v| Regexp.new(v) }


  services().each do |service_name, tags|
    if !services_blacklist.any? {|r| r.match(service_name)} && (instance_must_tag.nil? || tags.include?(instance_must_tag))
      service(service_name).each do |snode|
    %>consul_service_check_count{service="<%= service_name %>", node="<%= snode['Node']['Node'] %>"} <%= snode['Checks'].select{|chk| chk['ServiceID'] != ""}.length %>
consul_node_check_count{service="<%= service_name %>", node="<%= snode['Node']['Node'] %>"} <%= snode['Checks'].select{|chk| chk['ServiceID'] == ""}.length %>
<%
      end
    end
  end
%>