Monitoring and logging in Supabase

Introduction

Monitoring and logging help you watch your app and catch problems early. They show what is happening inside your system in real time or after events.

You want to know if your Supabase database is running smoothly.

You need to find out why your app crashed or slowed down.

You want to track user actions for security or debugging.

You want alerts when something goes wrong in your backend.

You want to improve your app by analyzing usage patterns.

Syntax

Supabase

supabase logs --project-ref <project_ref> --since <time_period>

--project-ref is your unique Supabase project ID.

--since lets you specify how far back to see logs, like '1h' for one hour.

Examples

Shows logs from the last 30 minutes for project 'abc123'.

Supabase

supabase logs --project-ref abc123 --since 30m

Shows logs from the last day for project 'xyz789'.

Supabase

supabase logs --project-ref xyz789 --since 1d

Sample Program

This command fetches the last 10 minutes of logs from the Supabase project with ID 'demo123'. It helps you see recent events and errors.

Supabase

supabase logs --project-ref demo123 --since 10m

Important Notes

You can combine monitoring with alerts to get notified automatically.

Logs can be filtered by severity like INFO, WARN, ERROR to find issues faster.

Supabase also supports real-time monitoring dashboards in its web console.

Summary

Monitoring and logging help you keep your app healthy and fix problems quickly.

Use the supabase logs command with your project ID and time range to see recent events.

Check logs regularly and set alerts for better app reliability.

Practice

1. What is the main purpose of monitoring and logging in Supabase?

easy

A. To keep your app healthy and fix problems quickly

B. To increase the app's loading speed

C. To add new features automatically

D. To change the app's user interface

Solution

1. Step 1: Understand monitoring and logging roles

   Monitoring and logging track app behavior and errors to maintain health.

2. Step 2: Identify the main goal

   The goal is to detect and fix problems quickly to keep the app running well.

3. Final Answer:

   To keep your app healthy and fix problems quickly -> Option A

4. Quick Check:

   Monitoring and logging = keep app healthy [OK]

Hint: Monitoring = health check; logging = problem records [OK]

Common Mistakes:

• Confusing monitoring with adding features
• Thinking logging changes UI
• Believing monitoring speeds up app

2. Which of the following is the correct command to view logs for a Supabase project with ref abc123 for the last 1 hour?

easy

A. supabase logs --id abc123 --time 1h

B. supabase log --project abc123 --last 1h

C. supabase logs --project-ref abc123 --since 1h

D. supabase logs -p abc123 -t 1hour

Solution

1. Step 1: Recall the correct syntax for logs command

   The correct command uses supabase logs with --project-ref and --since flags.

2. Step 2: Match the options with correct flags

   supabase logs --project-ref abc123 --since 1h matches the correct syntax: supabase logs --project-ref abc123 --since 1h.

3. Final Answer:

   supabase logs --project-ref abc123 --since 1h -> Option C

4. Quick Check:

   Correct flags = --project-ref and --since [OK]

Hint: Use --project-ref and --since flags with supabase logs [OK]

Common Mistakes:

• Using 'log' instead of 'logs'
• Wrong flag names like --id or --last
• Incorrect time format like '1hour'

3. What will be the output of the command supabase logs --project-ref xyz789 --since 30m?

medium

A. Shows logs from all projects for the last 30 minutes

B. Shows logs from project xyz789 for the last 30 minutes

C. Shows logs from project xyz789 for the last 30 hours

D. Returns an error because --since requires seconds

Solution

1. Step 1: Understand the command flags

   The --project-ref xyz789 specifies the project, and --since 30m means last 30 minutes.

2. Step 2: Interpret the output meaning

   The command outputs logs only for project xyz789 from the last 30 minutes.

3. Final Answer:

   Shows logs from project xyz789 for the last 30 minutes -> Option B

4. Quick Check:

   --project-ref + --since 30m = last 30 minutes logs [OK]

Hint: Since 30m means last 30 minutes logs [OK]

Common Mistakes:

• Thinking it shows logs for all projects
• Confusing 30m with 30 hours
• Assuming --since needs seconds only

4. You ran supabase logs --project-ref myproj --since 2h but got no output. What is the most likely reason?

medium

A. The project ref is incorrect or does not exist

B. The command requires --until flag as well

C. Logs are only available for the last 1 hour

D. The --since flag must be in seconds, not hours

Solution

1. Step 1: Check project ref validity

   If the project ref is wrong or missing, no logs will show.

2. Step 2: Verify command flags and log availability

   The command syntax is correct; logs are available beyond 1 hour; --since accepts hours.

3. Final Answer:

   The project ref is incorrect or does not exist -> Option A

4. Quick Check:

   No output usually means wrong project ref [OK]

Hint: Check project ref first if logs show empty [OK]

Common Mistakes:

• Thinking --until is mandatory
• Assuming logs only keep 1 hour
• Believing --since needs seconds only

5. You want to set up alerts to notify you when errors appear in your Supabase logs. Which approach is best?

hard

A. Regularly run supabase logs manually and check for errors

B. Restart the Supabase project daily to clear logs

C. Ignore logs and fix errors only when users report them

D. Use a third-party monitoring tool connected to Supabase logs with alert rules

Solution

1. Step 1: Understand alerting needs

   Manual checks are slow and error-prone; ignoring logs delays fixes.

2. Step 2: Choose best practice for alerts

   Using a monitoring tool with alert rules automates error detection and notification.

3. Final Answer:

   Use a third-party monitoring tool connected to Supabase logs with alert rules -> Option D

4. Quick Check:

   Automated alerts = faster fixes [OK]

Hint: Automate alerts with monitoring tools, not manual checks [OK]

Common Mistakes:

• Relying on manual log checks
• Ignoring logs until problems grow
• Restarting project clears logs but not errors