Index: daemon/log-daemon/BUILD.bazel
===================================================================
--- daemon/log-daemon/BUILD.bazel
+++ daemon/log-daemon/BUILD.bazel
@@ -345,6 +345,10 @@
         "com.databricks.daemon.log.LogDaemonConfSuite",
         {"tags": ["cpu:5"]},
     ),
+    (
+        "com.databricks.daemon.log.FeatureFlagMonitorSuite",
+        {"tags": ["cpu:4"]},
+    ),
     (
         "com.databricks.daemon.log.LogDaemonSuite",
         {
@@ -1024,6 +1028,7 @@
         "src/main/scala/com/databricks/daemon/log/conf/CheckManagerConf.scala",
         "src/main/scala/com/databricks/daemon/log/conf/DataVolumeCalculatorConf.scala",
         "src/main/scala/com/databricks/daemon/log/conf/EnvConf.scala",
+        "src/main/scala/com/databricks/daemon/log/conf/FeatureFlagMonitor.scala",
         "src/main/scala/com/databricks/daemon/log/conf/FileManagerConf.scala",
         "src/main/scala/com/databricks/daemon/log/conf/K8sConf.scala",
         "src/main/scala/com/databricks/daemon/log/conf/LogDaemonConfParser.scala",
Index: daemon/log-daemon/src/main/scala/com/databricks/daemon/log/conf/FeatureFlagMonitor.scala
===================================================================
--- /dev/null
+++ daemon/log-daemon/src/main/scala/com/databricks/daemon/log/conf/FeatureFlagMonitor.scala
@@ -0,0 +1,53 @@
+package com.databricks.daemon.log.conf
+
+import com.databricks.featureflag.client.DynamicConf
+import com.databricks.threading.NamedTimer
+
+import scala.collection.mutable.ArrayBuffer
+import scala.concurrent.duration._
+
+trait Reconfigurable {
+  def reconfigure(): Unit
+}
+
+trait FeatureFlagMonitor extends DynamicConf {
+  private[this] val changeTrackers = new ArrayBuffer[() => Boolean]
+  private[this] val reconfigurables = new ArrayBuffer[Reconfigurable]
+  private[this] val periodicThread = new NamedTimer("DynamicFlagChecker")
+  // TODO(hieu.le): Make delay configurable and jitter initial delay
+  periodicThread.scheduleWithFixedDelayWithInitialDelay(delay = 1.seconds, interval = 1.seconds) {
+    maybeReconfigure()
+  }
+
+  def createMonitoredFlag[T: Manifest](flagName: String, defaultValue: T): FeatureFlag[T] = {
+    val flag = FeatureFlag(flagName, defaultValue)
+
+    var lastValue = flag.getCurrentValue()
+    val hasChanged = () => {
+      val currentValue = flag.getCurrentValue()
+      val changed = currentValue != lastValue
+      if (changed) {
+        logger.info(s"FeatureFlag ${flag.flagName} has changed")
+        lastValue = currentValue
+      }
+      changed
+    }
+
+    this.synchronized {
+      changeTrackers.append(hasChanged)
+    }
+
+    flag
+  }
+
+  def registerReconfigurable(obj: Reconfigurable): Unit = this.synchronized {
+    reconfigurables.append(obj)
+  }
+
+  private[this] def maybeReconfigure(): Unit = this.synchronized {
+    val needReconfig: Boolean = changeTrackers.exists(_())
+    if (needReconfig) {
+      reconfigurables.foreach(_.reconfigure())
+    }
+  }
+}
Index: daemon/log-daemon/src/test/scala/com/databricks/daemon/log/conf/FeatureFlagMonitorSuite.scala
===================================================================
--- /dev/null
+++ daemon/log-daemon/src/test/scala/com/databricks/daemon/log/conf/FeatureFlagMonitorSuite.scala
@@ -0,0 +1,40 @@
+package com.databricks.daemon.log
+
+import com.databricks.backend.common.util.Project
+import com.databricks.conf.trusted.ProjectConf
+import com.databricks.daemon.log.conf.{FeatureFlagMonitor, Reconfigurable}
+import com.databricks.featureflag.client.FeatureFlagDefinition
+import com.databricks.featureflag.client.experimentation.MockFeatureFlagReaderProvider
+import com.databricks.testing.DatabricksTest
+import com.typesafe.config.ConfigFactory
+
+import java.util.concurrent.CountDownLatch
+
+case class DummyReconfigurable(var reconfigCount: Int = 0) extends Reconfigurable {
+  var reconfigLatch = new CountDownLatch(1)
+  override def reconfigure(): Unit = {
+    reconfigCount += 1
+    reconfigLatch.countDown()
+  }
+}
+
+class TestConfig
+    extends ProjectConf(Project.TestProject, ConfigFactory.parseString(""))
+    with FeatureFlagMonitor
+    with MockFeatureFlagReaderProvider {
+  @FeatureFlagDefinition(team = "eng-observability-team", description = "Test Flag")
+  private[log] val testFlag =
+    createMonitoredFlag("databricks.daemon.log.testFlag", defaultValue = 0)
+}
+
+class FeatureFlagMonitorSuite extends DatabricksTest {
+  test("FeatureFlagMonitorSuite - reconfigure upon flag change") {
+    val conf = new TestConfig
+    val reconfigurable = DummyReconfigurable()
+    conf.registerReconfigurable(reconfigurable)
+
+    conf.mockFeatureFlagReader.setMockValue(conf.testFlag.flagName, value = 1)
+    reconfigurable.reconfigLatch.await()
+    reconfigurable.reconfigCount should be(1)
+  }
+}