[SDFAB-743] Add SD-Fabric health indicator script

Add a new health indicator script to check if topology and UE connectivity
meet requirement

Change-Id: Id18052b45e502dad327d331c7c4d7f177488a444
diff --git a/apps/tost-telegraf/values.yaml b/apps/tost-telegraf/values.yaml
index 73514d9..e139fff 100644
--- a/apps/tost-telegraf/values.yaml
+++ b/apps/tost-telegraf/values.yaml
@@ -15,6 +15,9 @@
     - name: "telegraf-external-daemon"
       mountPath: /tmp/sdfabric_telegraf.sh
       subPath: sdfabric_telegraf.sh
+    - name: "telegraf-external-daemon"
+      mountPath: /tmp/sdfabric_health_indicator.sh
+      subPath: sdfabric_health_indicator.sh
   rbac:
     rules:
     - apiGroups: [""]
@@ -33,6 +36,9 @@
       - execd:
           command: ["sh", "-c", "/tmp/sdfabric_telegraf.sh"]
           signal: "STDIN"
+      - execd:
+          command: ["sh", "-c", "/tmp/sdfabric_health_indicator.sh"]
+          signal: "STDIN"
       - cisco_telemetry_gnmi:
           addresses:
             - 10.128.100.36:9339
@@ -55,4 +61,14 @@
   port: 8181
   namespace: tost
   onos_classic_label: app=onos-classic
+  atomix_label: app=onos-tost-atomix
   onos_config_loader_label: app=onos-config-loader
+
+health_indicator:
+  enabled: false
+  expected_hosts: []
+  rtt_threshold_ms: 30
+  # Health indicator return DOWN status when {packet_loss_threshold}% of packet loss
+  # from one of expected host.
+  packet_loss_threshold: 100
+  expected_num_links: 0