diff --git a/x-pack/plugins/fleet/common/types/models/agent.ts b/x-pack/plugins/fleet/common/types/models/agent.ts
index 5def12287b4fd..fa54f8c943e27 100644
--- a/x-pack/plugins/fleet/common/types/models/agent.ts
+++ b/x-pack/plugins/fleet/common/types/models/agent.ts
@@ -84,6 +84,7 @@ interface AgentBase {
   policy_revision?: number | null;
   last_checkin?: string;
   last_checkin_status?: 'error' | 'online' | 'degraded' | 'updating';
+  last_checkin_message?: string;
   user_provided_metadata: AgentMetadata;
   local_metadata: AgentMetadata;
   tags?: string[];
@@ -229,6 +230,10 @@ export interface FleetServerAgent {
    * Last checkin status
    */
   last_checkin_status?: 'error' | 'online' | 'degraded' | 'updating';
+  /**
+   * Last checkin message
+   */
+  last_checkin_message?: string;
   /**
    * ID of the API key the Elastic Agent uses to authenticate with elasticsearch
    */
diff --git a/x-pack/plugins/fleet/public/applications/fleet/sections/agents/agent_details_page/components/agent_details/agent_details_overview.tsx b/x-pack/plugins/fleet/public/applications/fleet/sections/agents/agent_details_page/components/agent_details/agent_details_overview.tsx
index 5799b130b6a46..11ddcef4c8aee 100644
--- a/x-pack/plugins/fleet/public/applications/fleet/sections/agents/agent_details_page/components/agent_details/agent_details_overview.tsx
+++ b/x-pack/plugins/fleet/public/applications/fleet/sections/agents/agent_details_page/components/agent_details/agent_details_overview.tsx
@@ -58,6 +58,12 @@ export const AgentDetailsOverviewSection: React.FunctionComponent<{
               '-'
             ),
           },
+          {
+            title: i18n.translate('xpack.fleet.agentDetails.lastCheckinMessageLabel', {
+              defaultMessage: 'Last checkin message',
+            }),
+            description: agent.last_checkin_message ? agent.last_checkin_message : '-',
+          },
           {
             title: i18n.translate('xpack.fleet.agentDetails.hostIdLabel', {
               defaultMessage: 'Agent ID',
diff --git a/x-pack/plugins/fleet/public/applications/fleet/sections/agents/components/agent_health.tsx b/x-pack/plugins/fleet/public/applications/fleet/sections/agents/components/agent_health.tsx
index b2c03ba745d7b..93091ff726258 100644
--- a/x-pack/plugins/fleet/public/applications/fleet/sections/agents/components/agent_health.tsx
+++ b/x-pack/plugins/fleet/public/applications/fleet/sections/agents/components/agent_health.tsx
@@ -74,8 +74,33 @@ export const AgentHealth: React.FunctionComponent<Props> = ({
   agent,
   showOfflinePreviousStatus,
 }) => {
-  const { last_checkin: lastCheckIn } = agent;
+  const { last_checkin: lastCheckIn, last_checkin_message: lastCheckInMessage } = agent;
   const msLastCheckIn = new Date(lastCheckIn || 0).getTime();
+  const lastCheckInMessageText = lastCheckInMessage ? (
+    <FormattedMessage
+      id="xpack.fleet.agentHealth.checkinMessageText"
+      defaultMessage="Last checkin message: {lastCheckinMessage}"
+      values={{
+        lastCheckinMessage: lastCheckInMessage,
+      }}
+    />
+  ) : null;
+  const lastCheckinText = msLastCheckIn ? (
+    <>
+      <FormattedMessage
+        id="xpack.fleet.agentHealth.checkInTooltipText"
+        defaultMessage="Last checked in {lastCheckIn}"
+        values={{
+          lastCheckIn: <FormattedRelative value={msLastCheckIn} />,
+        }}
+      />
+    </>
+  ) : (
+    <FormattedMessage
+      id="xpack.fleet.agentHealth.noCheckInTooltipText"
+      defaultMessage="Never checked in"
+    />
+  );
 
   const previousToOfflineStatus = useMemo(() => {
     if (!showOfflinePreviousStatus || agent.status !== 'offline') {
@@ -89,22 +114,10 @@ export const AgentHealth: React.FunctionComponent<Props> = ({
     <EuiToolTip
       position="top"
       content={
-        msLastCheckIn ? (
-          <>
-            <FormattedMessage
-              id="xpack.fleet.agentHealth.checkInTooltipText"
-              defaultMessage="Last checked in {lastCheckIn}"
-              values={{
-                lastCheckIn: <FormattedRelative value={msLastCheckIn} />,
-              }}
-            />
-          </>
-        ) : (
-          <FormattedMessage
-            id="xpack.fleet.agentHealth.noCheckInTooltipText"
-            defaultMessage="Never checked in"
-          />
-        )
+        <>
+          <p>{lastCheckinText}</p>
+          <p>{lastCheckInMessageText}</p>
+        </>
       }
     >
       <>