Nuxt Sitemap not updating in SSR mode - vue.js

Question

My project is in SSR mode with a cache time of 15 minutes. The sitemap.xml file works fine for what exists at build time, but it doesn't update after 15 minutes. Is there anything else I need to do to enable this functionality?
We're using pm2 to start the app. This is a Nuxt 2 app.
I setup the new sitemap function to fetch URLs from our headless CMS.
I set cacheTime to 15 minutes.
I checked the sitemap.xml, and it looked correct.
I updated our CMS to publish another article.
I waited 15 minutes.
The new article was not present, even though I expected it to be.
const path = require('path');
const fs = require('fs');
const env = process.env.NODE_ENV;
const envPath = path.resolve(process.cwd(), `.env.${env}`);
const defaultEnvPath = path.resolve(process.cwd(), '.env');
const axios = require('axios');
require('dotenv').config({
path: fs.existsSync(envPath) ? envPath : defaultEnvPath,
});
export default {
debug: true,
ssr: true,
port: process.env.PORT || 3000,
target: 'server',
// ...
async sitemap() {
const articleRoutes = [];
const now = new Date();
await axios
.get(ARTICLE_URL)
.then((response) => {
response.data.data.forEach((route) => {
const publishDate = new Date(route.publish_date);
if (publishDate < now) articleRoutes.push(`/${route.id}`);
});
})
.catch((error) => {
throw new Error(error);
});
return {
cacheTime: 1000 * 60 * 15, // 15 minutes
hostname: 'www.foo.bar',
gzip: true,
exclude: [...],
routes: articleRoutes,
};
},

Answer 1

I went and did a more thorough look through the documentation after reading some of the comments and saw I had made a mistake. I moved my api call onto the routes property, like in the following link, and my code started working:
https://sitemap.nuxtjs.org/usage/sitemap-options#from-a-function-which-returns-a-promise
sitemap() {
return {
cacheTime: 1000 * 60 * 15, // 15 minutes
hostname: 'www.foo.bar',
gzip: true,
exclude: [
//...
],
routes: async () => {
const articleRoutes = [];
const now = new Date();
await axios
.get(ARTICLES_URL)
.then((response) => {
response.data.data.forEach((route) => {
const publishDate = new Date(route.publish_date);
if (publishDate < now) articleRoutes.push(`/${route.id}`);
});
})
.catch((error) => {
throw new Error(error);
});
return articleRoutes;
},
};
It now seems to work and automatically rebuilds the sitemap as the documentation suggests.