KC-1029 updating MRC demo with observer promotion (#857)

Author: thomaskwscott

multiregion/config/placement-multi-region-async-op-leader-is-observer.json

@@ -0,0 +1,20 @@
+{
+  "version": 2,
+  "replicas": [
+    {
+      "count": 2,
+      "constraints": {
+        "rack": "west"
+      }
+    }
+  ],
+  "observers": [
+    {
+      "count": 2,
+      "constraints": {
+        "rack": "east"
+      }
+    }
+  ],
+  "observerPromotionPolicy":"leader-is-observer"
+}

multiregion/config/placement-multi-region-async-op-under-min-isr.json

@@ -0,0 +1,20 @@
+{
+    "version": 2,
+    "replicas": [
+        {
+            "count": 2,
+            "constraints": {
+                "rack": "west"
+            }
+        }
+    ],
+    "observers": [
+        {
+            "count": 2,
+            "constraints": {
+                "rack": "east"
+            }
+        }
+    ],
+    "observerPromotionPolicy":"under-min-isr"
+}

multiregion/config/placement-multi-region-async-op-under-replicated.json

@@ -0,0 +1,20 @@
+{
+  "version": 2,
+  "replicas": [
+    {
+      "count": 2,
+      "constraints": {
+        "rack": "west"
+      }
+    }
+  ],
+  "observers": [
+    {
+      "count": 2,
+      "constraints": {
+        "rack": "east"
+      }
+    }
+  ],
+  "observerPromotionPolicy":"under-replicated"
+}