feat: Harvest should monitor fabric link status

cmd/collectors/rest/plugins/snapmirror/snapmirror.go

@@ -113,6 +113,7 @@ func (m *SnapMirror) Run(dataMap map[string]*matrix.Matrix) ([]*matrix.Matrix, *
 	m.updateSMLabels(data)
 	m.currentVal++
 
+	m.checkFabricLinkStatus(data)
 	return []*matrix.Matrix{m.data}, m.client.Metadata, nil
 }
 
@@ -291,3 +292,29 @@ func (m *SnapMirror) handleSVMDRRelationships(data *matrix.Matrix, keys []string
 		}
 	}
 }
+
+func (m *SnapMirror) checkFabricLinkStatus(data *matrix.Matrix) {
+	for _, instance := range data.GetInstances() {
+		if !instance.IsExportable() {
+			continue
+		}
+		flStatus := strings.TrimSpace(instance.GetLabel("fl_status"))
+		// check if the fabric link status is healthy or not. Healthy looks like this:
+		// - FabricLink Status: active: 33 objects to transfer, pushing 19.9MB; throughput 25.5MB/sec, 16 ops/sec
+		// - FabricLink Status: ok; throughput 11.9MB/sec, 11 ops/sec
+		// - FabricLink Status: ok; throughput 11.9MB/sec, 11 ops/sec
+		// - FabricLink Status: ok
+		// - FabricLink Status is empty
+		// Unhealthy looks like this:
+		// - FabricLink Status: 20m overdue: 9 objects to transfer, pushing 9.4kb
+
+		flIsHealthy := flStatus == "" || strings.HasPrefix(flStatus, "ok") || strings.Contains(flStatus, "active")
+		health := instance.GetLabel("healthy")
+
+		// Then set fl_healthy label to true only if healthy label is also true and fabric link status is healthy. Otherwise, set it to false.
+		instance.SetLabel("fl_healthy", "false")
+		if flIsHealthy && health == "true" {
+			instance.SetLabel("fl_healthy", "true")
+		}
+	}
+}

conf/rest/9.12.0/snapmirror.yaml

@@ -11,6 +11,7 @@ counters:
   - ^destination_volume                      => destination_volume
   - ^destination_volume_node                 => destination_node
   - ^destination_vserver                     => destination_vserver
+  - ^fl_status                               => fl_status
   - ^healthy                                 => healthy
   - ^last_transfer_type                      => last_transfer_type
   - ^policy_type                             => policy_type
@@ -64,6 +65,7 @@ export_options:
   instance_labels:
     - derived_relationship_type
     - destination_cg_name
+    - fl_healthy
     - group_type
     - healthy
     - last_transfer_error