implemented option to do implicit or explicit service scanning, selec…

…ted using Docker labels

swarm.go

@@ -238,9 +238,17 @@ func discoverSwarm(prometheusContainerID string, outputFile string, discoveryTyp
 
  for _, task := range tasks {
 
- if _, ok := task.Spec.ContainerSpec.Labels[excludeLabel]; ok {
- logger.Debugf("Task %s ignored by Prometheus", task.ID)
- continue
+ if discoveryType == implicit {
+ if _, ok := task.Spec.ContainerSpec.Labels[excludeLabel]; ok {
+ logger.Debugf("Task %s ignored by Prometheus", task.ID)
+ continue
+ }
+ } else if discoveryType == explicit {
+ if _, ok := task.Spec.ContainerSpec.Labels[includeLabel]; ok {
+ logger.Debugf("Task %s should be scanned by Prometheus", task.ID)
+ } else {
+ continue
+ }
  }
 
  ports := collectPorts(task, serviceIDMap)
@@ -251,6 +259,8 @@ func discoverSwarm(prometheusContainerID string, outputFile string, discoveryTyp
  allNetworks[k] = v
  }
 
+ // if exposed ports are found, or ports defined through labels, add them to the Prometheus target.
+ // if not, add only the container IP as a target, and Prometheus will use the default port (80).
  for _, ip := range containerIPs {
  if len(ports) > 0 {
  for port := range ports {