diff --git a/python/ray/_raylet.pyx b/python/ray/_raylet.pyx
index 973f778d8..aad636723 100644
--- a/python/ray/_raylet.pyx
+++ b/python/ray/_raylet.pyx
@@ -138,7 +138,8 @@ else:
     import cPickle as pickle
 
 if PY3:
-    from ray.async_compat import sync_to_async, AsyncGetResponse
+    from ray.async_compat import (sync_to_async,
+                                  AsyncGetResponse, AsyncMonitorState)
 
 
 def set_internal_config(dict options):
@@ -609,10 +610,16 @@ cdef execute_task(
 
                 coroutine = async_function(actor, *arguments, **kwarguments)
                 loop = core_worker.create_or_get_event_loop()
-
+                monitor_state = loop.monitor_state
+                monitor_state.register_coroutine(coroutine,
+                                                 str(function.method))
                 future = asyncio.run_coroutine_threadsafe(coroutine, loop)
-                future.add_done_callback(
-                    lambda future: fiber_event.Notify())
+
+                def callback(future):
+                    fiber_event.Notify()
+                    monitor_state.unregister_coroutine(coroutine)
+
+                future.add_done_callback(callback)
 
                 with nogil:
                     (core_worker.core_worker.get()
@@ -814,8 +821,8 @@ cdef class CoreWorker:
     def get_actor_id(self):
         return ActorID(self.core_worker.get().GetActorId().Binary())
 
-    def set_webui_display(self, message):
-        self.core_worker.get().SetWebuiDisplay(message)
+    def set_webui_display(self, key, message):
+        self.core_worker.get().SetWebuiDisplay(key, message)
 
     def set_actor_title(self, title):
         self.core_worker.get().SetActorTitle(title)
@@ -1187,6 +1194,11 @@ cdef class CoreWorker:
             # Delayed import due to async_api depends on _raylet.
             from ray.experimental.async_api import _async_init
             self.async_event_loop.run_until_complete(_async_init())
+
+            # Create and attach the monitor object
+            monitor_state = AsyncMonitorState(self.async_event_loop)
+            self.async_event_loop.monitor_state = monitor_state
+
         if self.async_thread is None:
             self.async_thread = threading.Thread(
                 target=lambda: self.async_event_loop.run_forever()
diff --git a/python/ray/actor.py b/python/ray/actor.py
index 0223c2ef7..1d9ef73d7 100644
--- a/python/ray/actor.py
+++ b/python/ray/actor.py
@@ -359,8 +359,7 @@ class ActorClass:
                 is_direct_call=None,
                 max_concurrency=None,
                 name=None,
-                detached=False,
-                is_asyncio=False):
+                detached=False):
         """Create an actor.
 
         This method allows more flexibility than the remote method because
@@ -386,8 +385,6 @@ class ActorClass:
             name: The globally unique name for the actor.
             detached: Whether the actor should be kept alive after driver
                 exits.
-            is_asyncio: Turn on async actor calls. This only works with direct
-                actor calls.
 
         Returns:
             A handle to the newly created actor.
@@ -398,6 +395,14 @@ class ActorClass:
             kwargs = {}
         if is_direct_call is None:
             is_direct_call = ray_constants.direct_call_enabled()
+
+        meta = self.__ray_metadata__
+        actor_has_async_methods = len(
+            inspect.getmembers(
+                meta.modified_class,
+                predicate=inspect.iscoroutinefunction)) > 0
+        is_asyncio = actor_has_async_methods
+
         if max_concurrency is None:
             if is_asyncio:
                 max_concurrency = 1000
@@ -419,8 +424,6 @@ class ActorClass:
             raise Exception("Actors cannot be created before ray.init() "
                             "has been called.")
 
-        meta = self.__ray_metadata__
-
         if detached and name is None:
             raise Exception("Detached actors must be named. "
                             "Please use Actor._remote(name='some_name') "
diff --git a/python/ray/async_compat.py b/python/ray/async_compat.py
index 143eb1c88..23540e23c 100644
--- a/python/ray/async_compat.py
+++ b/python/ray/async_compat.py
@@ -3,8 +3,9 @@ This file should only be imported from Python 3.
 It will raise SyntaxError when importing from Python 2.
 """
 import asyncio
-from collections import namedtuple
+from collections import namedtuple, Counter
 import time
+import threading
 
 import ray
 
@@ -96,3 +97,35 @@ def get_async(object_id):
     user_future.object_id = object_id
 
     return user_future
+
+
+class AsyncMonitorState:
+    def __init__(self, loop):
+        self.names = dict()
+        self.names_lock = threading.Lock()
+
+        self.sleep_time = 1.0
+        asyncio.ensure_future(self.monitor(), loop=loop)
+
+    async def monitor(self):
+        while True:
+            await asyncio.sleep(self.sleep_time)
+            all_tasks = self.get_all_task_names()
+            ray.show_in_webui(
+                str(len(all_tasks)), key="Number of concurrent task runing")
+            ray.show_in_webui(
+                str(dict(Counter(all_tasks))), key="Concurrent tasks")
+
+    def register_coroutine(self, coro, name):
+        with self.names_lock:
+            self.names[coro] = name
+
+    def unregister_coroutine(self, coro):
+        with self.names_lock:
+            self.names.pop(coro)
+
+    def get_all_task_names(self):
+        names = []
+        with self.names_lock:
+            names = list(self.names.values())
+        return names
diff --git a/python/ray/dashboard/client/src/api.ts b/python/ray/dashboard/client/src/api.ts
index 1719da764..05fa47b18 100644
--- a/python/ray/dashboard/client/src/api.ts
+++ b/python/ray/dashboard/client/src/api.ts
@@ -120,7 +120,7 @@ export interface RayletInfoResponse {
           usedResources: { [key: string]: number };
           currentTaskDesc?: string;
           numPendingTasks?: number;
-          webuiDisplay?: string;
+          webuiDisplay?: Record<string, string>;
         }
       | {
           actorId: string;
diff --git a/python/ray/dashboard/client/src/pages/dashboard/logical-view/Actor.tsx b/python/ray/dashboard/client/src/pages/dashboard/logical-view/Actor.tsx
index 2475aed14..160362e30 100644
--- a/python/ray/dashboard/client/src/pages/dashboard/logical-view/Actor.tsx
+++ b/python/ray/dashboard/client/src/pages/dashboard/logical-view/Actor.tsx
@@ -1,4 +1,3 @@
-import Collapse from "@material-ui/core/Collapse";
 import { Theme } from "@material-ui/core/styles/createMuiTheme";
 import createStyles from "@material-ui/core/styles/createStyles";
 import withStyles, { WithStyles } from "@material-ui/core/styles/withStyles";
@@ -12,6 +11,7 @@ import {
   RayletInfoResponse
 } from "../../../api";
 import Actors from "./Actors";
+import Collapse from "@material-ui/core/Collapse";
 
 const styles = (theme: Theme) =>
   createStyles({
@@ -171,6 +171,39 @@ class Actor extends React.Component<Props & WithStyles<typeof styles>, State> {
             }
           ];
 
+    // Construct the custom message from the actor.
+    let actorCustomDisplay: JSX.Element[] = [];
+    if (actor.state !== -1 && actor.webuiDisplay) {
+      actorCustomDisplay = Object.keys(actor.webuiDisplay)
+        .sort()
+        .map((key, _, __) => {
+          // Construct the value from actor.
+          // Please refer to worker.py::show_in_webui for schema.
+          const valueEncoded = actor.webuiDisplay![key];
+          const valueParsed = JSON.parse(valueEncoded);
+          let valueRendered = valueParsed["message"];
+          if (valueParsed["dtype"] === "html") {
+            valueRendered = (
+              <div dangerouslySetInnerHTML={{ __html: valueRendered }}></div>
+            );
+          }
+
+          if (key === "") {
+            return (
+              <Typography className={classes.webuiDisplay}>
+                &nbsp; &nbsp; {valueRendered}
+              </Typography>
+            );
+          } else {
+            return (
+              <Typography className={classes.webuiDisplay}>
+                &nbsp; &nbsp; {key}: {valueRendered}
+              </Typography>
+            );
+          }
+        });
+    }
+
     return (
       <div className={classes.root}>
         <Typography className={classes.title}>
@@ -249,11 +282,10 @@ class Actor extends React.Component<Props & WithStyles<typeof styles>, State> {
         </Typography>
         {actor.state !== -1 && (
           <React.Fragment>
-            {actor.webuiDisplay && (
-              <Typography className={classes.webuiDisplay}>
-                {actor.webuiDisplay}
-              </Typography>
+            {actorCustomDisplay.length > 0 && (
+              <React.Fragment>{actorCustomDisplay}</React.Fragment>
             )}
+
             <Collapse in={expanded}>
               <Actors actors={actor.children} />
             </Collapse>
diff --git a/python/ray/experimental/async_api.py b/python/ray/experimental/async_api.py
index 5cbbc929e..0d10cca1d 100644
--- a/python/ray/experimental/async_api.py
+++ b/python/ray/experimental/async_api.py
@@ -94,13 +94,15 @@ def init():
 
     loop = asyncio.get_event_loop()
     if loop.is_running():
-        assert loop._thread_id != threading.get_ident(), (
-            "You are using async_api inside a running event loop. "
-            "Please call `await _async_init()` to initialize inside "
-            "asynchrounous context.")
-        # If the loop is runing outside current thread, we actually need
-        # to do this to make sure the context is initialized.
-        asyncio.run_coroutine_threadsafe(_async_init(), loop=loop)
+        if loop._thread_id != threading.get_ident():
+            # If the loop is runing outside current thread, we actually need
+            # to do this to make sure the context is initialized.
+            asyncio.run_coroutine_threadsafe(_async_init(), loop=loop)
+        else:
+            async_init_done = asyncio.get_event_loop().create_task(
+                _async_init())
+            # Block until the async init finishes.
+            async_init_done.done()
     else:
         asyncio.get_event_loop().run_until_complete(_async_init())
 
diff --git a/python/ray/includes/libcoreworker.pxd b/python/ray/includes/libcoreworker.pxd
index 09d826381..49aa706fb 100644
--- a/python/ray/includes/libcoreworker.pxd
+++ b/python/ray/includes/libcoreworker.pxd
@@ -113,8 +113,8 @@ cdef extern from "ray/core_worker/core_worker.h" nogil:
         CJobID GetCurrentJobId()
         CTaskID GetCurrentTaskId()
         const CActorID &GetActorId()
-        void SetWebuiDisplay(const c_string &message)
         void SetActorTitle(const c_string &title)
+        void SetWebuiDisplay(const c_string &key, const c_string &message)
         CTaskID GetCallerId()
         const ResourceMappingType &GetResourceIDs() const
         CActorID DeserializeAndRegisterActorHandle(const c_string &bytes)
diff --git a/python/ray/tests/py3_test.py b/python/ray/tests/py3_test.py
index 02700057c..4ebfad1f2 100644
--- a/python/ray/tests/py3_test.py
+++ b/python/ray/tests/py3_test.py
@@ -110,7 +110,7 @@ def test_asyncio_actor(ray_start_regular_shared):
                 await self.event.wait()
             return sorted(self.batch)
 
-    a = AsyncBatcher.options(is_direct_call=True, is_asyncio=True).remote()
+    a = AsyncBatcher.options(is_direct_call=True).remote()
     x1 = a.add.remote(1)
     x2 = a.add.remote(2)
     x3 = a.add.remote(3)
@@ -130,7 +130,7 @@ def test_asyncio_actor_same_thread(ray_start_regular_shared):
         async def async_thread_id(self):
             return threading.current_thread().ident
 
-    a = Actor.options(is_direct_call=True, is_asyncio=True).remote()
+    a = Actor.options(is_direct_call=True).remote()
     sync_id, async_id = ray.get(
         [a.sync_thread_id.remote(),
          a.async_thread_id.remote()])
@@ -154,8 +154,7 @@ def test_asyncio_actor_concurrency(ray_start_regular_shared):
 
     num_calls = 10
 
-    a = RecordOrder.options(
-        is_direct_call=True, max_concurrency=1, is_asyncio=True).remote()
+    a = RecordOrder.options(is_direct_call=True, max_concurrency=1).remote()
     ray.get([a.do_work.remote() for _ in range(num_calls)])
     history = ray.get(a.get_history.remote())
 
@@ -189,8 +188,7 @@ def test_asyncio_actor_high_concurrency(ray_start_regular_shared):
 
     batch_size = sys.getrecursionlimit() * 4
     actor = AsyncConcurrencyBatcher.options(
-        is_asyncio=True, max_concurrency=batch_size * 2,
-        is_direct_call=True).remote(batch_size)
+        max_concurrency=batch_size * 2, is_direct_call=True).remote(batch_size)
     result = ray.get([actor.add.remote(i) for i in range(batch_size)])
     assert result[0] == list(range(batch_size))
     assert result[-1] == list(range(batch_size))
@@ -264,6 +262,6 @@ def test_asyncio_actor_async_get(ray_start_regular_shared):
         async def plasma_get(self):
             return await plasma_object
 
-    getter = AsyncGetter.options(is_asyncio=True).remote()
+    getter = AsyncGetter.options().remote()
     assert ray.get(getter.get.remote()) == 1
     assert ray.get(getter.plasma_get.remote()) == 2
diff --git a/python/ray/tests/test_metrics.py b/python/ray/tests/test_metrics.py
index d9ef78857..6e1bf1a23 100644
--- a/python/ray/tests/test_metrics.py
+++ b/python/ray/tests/test_metrics.py
@@ -61,11 +61,11 @@ def test_worker_stats(shutdown_only):
     target_worker_present = False
     for worker in reply.workers_stats:
         stats = worker.core_worker_stats
-        if stats.webui_display == "test":
+        if stats.webui_display[""] == '{"message": "test", "dtype": "text"}':
             target_worker_present = True
             assert worker.pid == worker_pid
         else:
-            assert stats.webui_display == ""
+            assert stats.webui_display[""] == ""  # Empty proto
     assert target_worker_present
 
     # Test show_in_webui for remote actors.
@@ -75,11 +75,11 @@ def test_worker_stats(shutdown_only):
     target_worker_present = False
     for worker in reply.workers_stats:
         stats = worker.core_worker_stats
-        if stats.webui_display == "test":
+        if stats.webui_display[""] == '{"message": "test", "dtype": "text"}':
             target_worker_present = True
             assert worker.pid == worker_pid
         else:
-            assert stats.webui_display == ""
+            assert stats.webui_display[""] == ""  # Empty proto
     assert target_worker_present
 
     timeout_seconds = 20
diff --git a/python/ray/worker.py b/python/ray/worker.py
index e292fb1f9..22e5a1e69 100644
--- a/python/ray/worker.py
+++ b/python/ray/worker.py
@@ -1422,7 +1422,7 @@ def register_custom_serializer(cls,
         class_id=class_id)
 
 
-def show_in_webui(message):
+def show_in_webui(message, key="", dtype="text"):
     """Display message in dashboard.
 
     Display message for the current task or actor in the dashboard.
@@ -1431,10 +1431,23 @@ def show_in_webui(message):
 
     Args:
         message (str): Message to be displayed.
+        key (str): The key name for the message. Multiple message under
+            different keys will be displayed at the same time. Messages
+            under the same key will be overriden.
+        data_type (str): The type of message for rendering. One of the
+            following: text, html.
     """
     worker = global_worker
     worker.check_connected()
-    worker.core_worker.set_webui_display(message.encode())
+
+    acceptable_dtypes = {"text", "html"}
+    assert dtype in acceptable_dtypes, "dtype accepts only: {}".format(
+        acceptable_dtypes)
+
+    message_wrapped = {"message": message, "dtype": dtype}
+    message_encoded = json.dumps(message_wrapped).encode()
+
+    worker.core_worker.set_webui_display(key.encode(), message_encoded)
 
 
 def get(object_ids, timeout=None):
diff --git a/src/ray/core_worker/core_worker.cc b/src/ray/core_worker/core_worker.cc
index edc205a42..704528cbf 100644
--- a/src/ray/core_worker/core_worker.cc
+++ b/src/ray/core_worker/core_worker.cc
@@ -1188,8 +1188,11 @@ void CoreWorker::HandleGetCoreWorkerStats(const rpc::GetCoreWorkerStatsRequest &
     }
     (*used_resources_map)[it.first] = quantity;
   }
-  stats->set_webui_display(webui_display_);
   stats->set_actor_title(actor_title_);
+  google::protobuf::Map<std::string, std::string> webui_map(webui_display_.begin(),
+                                                            webui_display_.end());
+  (*stats->mutable_webui_display()) = webui_map;
+
   MemoryStoreStats memory_store_stats = memory_store_->GetMemoryStoreStatisticalData();
   stats->set_num_local_objects(memory_store_stats.num_local_objects);
   stats->set_used_object_store_memory(memory_store_stats.used_object_store_memory);
@@ -1221,9 +1224,9 @@ void CoreWorker::SetActorId(const ActorID &actor_id) {
   actor_id_ = actor_id;
 }
 
-void CoreWorker::SetWebuiDisplay(const std::string &message) {
+void CoreWorker::SetWebuiDisplay(const std::string &key, const std::string &message) {
   absl::MutexLock lock(&mutex_);
-  webui_display_ = message;
+  webui_display_[key] = message;
 }
 
 void CoreWorker::SetActorTitle(const std::string &title) {
diff --git a/src/ray/core_worker/core_worker.h b/src/ray/core_worker/core_worker.h
index 57b833759..88f518a1f 100644
--- a/src/ray/core_worker/core_worker.h
+++ b/src/ray/core_worker/core_worker.h
@@ -97,7 +97,7 @@ class CoreWorker : public rpc::CoreWorkerServiceHandler {
 
   void SetActorId(const ActorID &actor_id);
 
-  void SetWebuiDisplay(const std::string &message);
+  void SetWebuiDisplay(const std::string &key, const std::string &message);
 
   void SetActorTitle(const std::string &title);
 
@@ -656,8 +656,8 @@ class CoreWorker : public rpc::CoreWorkerServiceHandler {
   /// we cannot access the thread-local worker contexts from GetCoreWorkerStats()
   TaskSpecification current_task_ GUARDED_BY(mutex_);
 
-  /// String to be displayed on Web UI.
-  std::string webui_display_ GUARDED_BY(mutex_);
+  /// Key value pairs to be displayed on Web UI.
+  std::unordered_map<std::string, std::string> webui_display_ GUARDED_BY(mutex_);
 
   /// Actor title that consists of class name, args, kwargs for actor construction.
   std::string actor_title_ GUARDED_BY(mutex_);
diff --git a/src/ray/protobuf/common.proto b/src/ray/protobuf/common.proto
index b1d9db3c0..d6ed85bba 100644
--- a/src/ray/protobuf/common.proto
+++ b/src/ray/protobuf/common.proto
@@ -205,7 +205,7 @@ message CoreWorkerStats {
   // A map from the resource name (e.g. "CPU") to the amount of resource used.
   map<string, double> used_resources = 9;
   // A string displayed on Dashboard.
-  string webui_display = 10;
+  map<string, string> webui_display = 10;
   // Number of objects stored in local memory.
   int32 num_local_objects = 11;
   // Used local object store memory.