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packages/testing/playwright/tests/infrastructure/chaos/multimain.spec.ts

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+import type { LogEntry } from 'n8n-containers';
+
+import { test, expect } from '../../../fixtures/base';
+
+// Enable observability to use VictoriaLogs for log queries
+test.use({ capability: 'observability' });
+
+// Helper to extract container name from log entry
+// Vector enriches logs with Docker metadata including container_name
+const getContainerName = (log: LogEntry): string | undefined => log.container_name ?? log.container;
+
+test('Leader election @mode:multi-main @chaostest @capability:observability', {
+	annotation: [
+		{ type: 'owner', description: 'Catalysts' },
+	],
+}, async ({
+	n8nContainer,
+	services,
+}) => {
+	// Find the current leader by querying VictoriaLogs
+	// Vector enriches logs with container_name from Docker metadata
+	const leaderLog = await services.observability.logs.waitForLog('Leader is now this', {
+		timeoutMs: 30000,
+		start: '-5m',
+	});
+
+	expect(leaderLog, 'Leader should be found').toBeDefined();
+
+	// Extract the leader container name from the log entry
+	const currentLeader = getContainerName(leaderLog!);
+	expect(currentLeader, 'Leader container_name should be in log entry').toBeDefined();
+
+	// Stop the leader container
+	await n8nContainer.stopContainer(currentLeader!);
+
+	// Wait for new leader election (another instance should take over)
+	// Use LogsQL to exclude logs from the stopped container
+	const newLeaderLog = await services.observability.logs.waitForLog(
+		`Leader is now this AND NOT container_name:${currentLeader}`,
+		{
+			timeoutMs: 30000,
+			start: '-5m', // Look at all recent logs, filtering by container excludes the old leader
+		},
+	);
+
+	expect(newLeaderLog).toBeDefined();
+	const newLeader = getContainerName(newLeaderLog!);
+	expect(newLeader).toBeDefined();
+	expect(newLeader).not.toBe(currentLeader);
+});

packages/testing/playwright/tests/infrastructure/chaos/postgres.spec.ts

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+import { Time } from '@n8n/constants';
+
+import { test, expect } from '../../../fixtures/base';
+
+// Enable observability to use VictoriaLogs for log queries
+test.use({ capability: 'observability' });
+
+// @CATS team to look at this.  This works locally, but not in CI. Maybe IP table rules are not working in CI?
+// eslint-disable-next-line playwright/no-skipped-test
+test.skip(
+	'Database connection timeout health check bug @mode:postgres @chaostest @capability:observability',
+	{
+		annotation: [
+			{ type: 'owner', description: 'Catalysts' },
+			{ type: 'issue', description: 'CAT-1018' },
+		],
+	},
+	async ({ api, n8nContainer, services }) => {
+		test.setTimeout(300000);
+
+		// ========== SETUP: Verify Initial Health ==========
+		// Ensure n8n starts in a healthy state before we begin chaos testing
+		{
+			const isLive = await api.isHealthy('liveness');
+			const isReady = await api.isHealthy('readiness');
+			expect(isLive).toBe(true);
+			expect(isReady).toBe(true);
+		}
+
+		// ========== CHAOS INJECTION: Block Database Traffic ==========
+		// Find postgres container and install iptables to simulate network issues
+		const postgres = n8nContainer.findContainers('postgres*')[0];
+
+		// Install iptables in the postgres container (Alpine Linux)
+		const apkUpdate = await postgres.exec(['apk', 'update']);
+		const apkInstall = await postgres.exec(['apk', 'add', 'iptables']);
+		// Block all incoming TCP traffic to PostgreSQL port 5432
+		// This simulates a network partition between n8n and the database
+		const rule = ['INPUT', '-p', 'tcp', '--dport', '5432', '-j', 'DROP'];
+		const blockPostgresTraffic = await postgres.exec(['iptables', '-A', ...rule]);
+		expect(apkUpdate.exitCode).toBe(0);
+		expect(apkInstall.exitCode).toBe(0);
+		expect(blockPostgresTraffic.exitCode).toBe(0);
+
+		// ========== WAIT FOR CONNECTION ISSUES ==========
+		// Query VictoriaLogs for database timeout messages
+		await services.observability.logs.waitForLog('Database connection timed out', {
+			timeoutMs: 20 * Time.seconds.toMilliseconds,
+			start: '-1m',
+		});
+
+		// ========== VERIFY: Health Checks ==========
+		{
+			const isLive = await api.isHealthy('liveness');
+			const isReady = await api.isHealthy('readiness');
+			expect(isLive).toBe(true);
+			expect(isReady).toBe(false);
+		}
+
+		// ========== RESTORE DATABASE CONNECTION ==========
+		// Remove the iptables rule to allow traffic again
+		const allowPostgresTraffic = await postgres.exec(['iptables', '-D', ...rule]);
+		expect(allowPostgresTraffic.exitCode).toBe(0);
+
+		// ========== VERIFY: Automatic Recovery ==========
+		// Query VictoriaLogs for database recovery messages
+		await services.observability.logs.waitForLog('Database connection recovered', {
+			timeoutMs: 20 * Time.seconds.toMilliseconds,
+			start: '-1m',
+		});
+	},
+);