docs: add troubleshooting for subscribers + scheduled jobs not working (#13762)

www/apps/resources/app/troubleshooting/scheduled-job-not-running/page.mdx

@@ -1,4 +1,5 @@
 import NotRunning from "../_sections/scheduled-jobs/not-running.mdx"
+import NotRunningWorkerMode from "../_sections/scheduled-jobs/not-running-worker-mode.mdx"
 
 export const metadata = {
   title: `Scheduled Job Not Running on Schedule`,
@@ -6,4 +7,46 @@ export const metadata = {
 
 # {metadata.title}
 
-<NotRunning />
+This guide helps you troubleshoot issues when a scheduled job in your Medusa application is not running, or running at unexpected times.
+
+## Confirm Job is Set Up Correctly
+
+Make sure that the scheduled job is set up correctly in your Medusa application. Check the following:
+
+1. The job is created under the `src/jobs` directory.
+2. The job exports an asynchronous function that performs the task. For example:
+
+```ts title="src/jobs/hello-world.ts"
+import { MedusaContainer } from "@medusajs/framework/types"
+
+export default async function greetingJob(container: MedusaContainer) {
+  const logger = container.resolve("logger")
+
+  logger.info("Greeting!")
+}
+```
+
+3. The job exports a `config` object that has the following properties:
+   - `name`: A unique name for the job.
+   - `schedule`: A string that holds a [cron expression](https://crontab.guru/) or an `interval` indicating the schedule to run the job.
+
+For example:
+
+```ts title="src/jobs/hello-world.ts"
+export const config = {
+  name: "greeting-every-minute",
+  schedule: "* * * * *",
+}
+```
+
+---
+
+## Job Not Running on Schedule
+
+<NotRunning />
+
+---
+
+## Confirm Worker Mode is Set Up Correctly
+
+<NotRunningWorkerMode />