feat: Add PagerDuty Integration (#565)

Co-authored-by: Jef LeCompte <jeffreylec@gmail.com>

src/notification/pagerduty.ts

@@ -0,0 +1,32 @@
+import {Link, Store} from '../store/model';
+import {Print, logger} from '../logger';
+import PDClient from 'node-pagerduty';
+import {config} from '../config';
+
+const pd = new PDClient('');
+
+export function sendPagerDutyNotification(link: Link, store: Store) {
+	if (config.notifications.pagerduty.integrationKey) {
+		logger.debug('↗ sending pagerduty message');
+		const links = [
+			{href: link.url, text: 'Visit Store'}
+		];
+		if (link.cartUrl) {
+			links.push({
+				href: link.cartUrl, text: 'Add to Cart'
+			});
+		}
+
+		pd.events.sendEvent({
+			dedup_key: link.url,
+			event_action: 'trigger',
+			payload: {
+				links,
+				severity: config.notifications.pagerduty.severity,
+				source: store.name,
+				summary: Print.inStock(link, store)
+			},
+			routing_key: config.notifications.pagerduty.integrationKey
+		});
+	}
+}