docs: add status message section to Actor lifecycle page

docs/02_concepts/01_actor_lifecycle.mdx

@@ -13,6 +13,7 @@ import CodeBlock from '@theme/CodeBlock';
 
 import MainSource from '!!raw-loader!./apify_platform_main.ts';
 import InitExitSource from '!!raw-loader!./apify_platform_init_exit.ts';
+import StatusMessageSource from '!!raw-loader!./code/status_message.ts';
 
 [Apify](https://apify.com) is a platform built to serve large-scale and high-performance web scraping
 and automation needs. It provides easy access to compute instances (_Actors_),
@@ -198,6 +199,18 @@ When the <ApiLink to="apify/class/Dataset">`Dataset`</ApiLink> is stored on the
 - [Datasets API reference](https://docs.apify.com/api/v2#/reference/datasets)
 - [Request queues API reference](https://docs.apify.com/api/v2#/reference/request-queues)
 
+## Status messages
+
+[Status messages](https://docs.apify.com//platform/actors/development/programming-interface/status-messages) are lightweight, human-readable progress indicators displayed with the Actor run in the Apify Console (separate from logs). Use them to communicate high-level phases or milestones, such as "Fetching list", "Processed 120/500 pages", or "Uploading results".
+
+Update the status only when the user's understanding of progress changes - avoid frequent updates for every processed item. Detailed information should go to logs or storages (Dataset, Key-value store) instead.
+
+Use <ApiLink to="class/Actor#setStatusMessage">`Actor.setStatusMessage()`</ApiLink> to set the message:
+
+<CodeBlock language="js">{StatusMessageSource}</CodeBlock>
+
+The SDK only sends an API request when the message text changes, so repeating the same message incurs no additional cost.
+
 ## Environment variables
 
 The following are some additional environment variables specific to Apify platform. More Crawlee specific environment variables could be found in the <CrawleeLink to="docs/guides/configuration#environment-variables">Environment Variables</CrawleeLink> guide.

docs/02_concepts/code/status_message.ts

@@ -0,0 +1,30 @@
+import { Actor } from 'apify';
+
+await Actor.init();
+
+// highlight-start
+await Actor.setStatusMessage('Fetching the list of URLs...');
+// highlight-end
+
+// Simulate some work
+const urls = [
+    'https://example.com/1',
+    'https://example.com/2',
+    'https://example.com/3',
+];
+
+for (let i = 0; i < urls.length; i++) {
+    // Process each URL...
+    // highlight-start
+    await Actor.setStatusMessage(`Processing ${i + 1} of ${urls.length} URLs`);
+    // highlight-end
+}
+
+// highlight-start
+// Mark the final status message as terminal
+await Actor.setStatusMessage('All URLs processed successfully!', {
+    isStatusMessageTerminal: true,
+});
+// highlight-end
+
+await Actor.exit();