Monitoring

Google Stackdriver

Free tier: 5 GB of logs with 7 day retention, read access API, basic email alerting
Pros: Integrated monitoring, logging and diagnostics suite for applications running on Google Cloud Platform and Amazon Web Services.

Free tier: monitor up to 20 jobs, invite two team members.
Pros: Monitor cron jobs, background services, scheduled tasks. API access, many integrations, open-source (can be self-hosted).
Limitations: no SMS notifications for the free tier, no SSO login options

Free tier tier: 1000 errors per month, unlimited projects.
Pros: Full stack Exception monitoring, Uptime monitoring, and Check-in/Cron Monitoring
Limitations: 3 users, 15 day data retention, 5 uptime checks and 5 check-ins per month. Integrates with: GitHub, GitLab, SMS, Email, Slack, and more
Exceeding the free tier: Honeybadger continues to process up to 125% of the limit before stop processing data until the end of the month. Also sends email alerts.

Free tier: (Developer plan) 100 metric streams at 60s resolution 1 day retention, 10 alerts, 1 dashboard.
Pros: allows for submission of metrics from multiple sources, metrics can be submitted via an agent or directly to the API.

Free tier: 100 GB/month, 1 free full access user, unlimited free basic users.
Pros: Collect all your telemetry data (including logs) in one place to deliver full-stack observability and power AI-driven insights so you can confidently improve service reliability and accelerate time to market. Supports most popular back-end, front-end, infrastructure, and cloud frameworks and services.
Exceeding the free tier: After exceeding the 100 GB/month you will see a paywall asking you to add a credit card. Data collection will continue and access to key pages to lower data ingest will still be available.

Free tier: 30 minutes retention, 5 hosts, unlimited dashboards, unlimited users, 1 alert
Pros: includes APM, infrastructure monitoring, and custom metrics, out of the box charts and filtering, REST API, correlation with logs, integration with Slack, HipChat, PagerDuty, OpsGenie, VictorOps, BigPanda, WebHooks, Nagios…

Free tier: 50 websites/servers, 5 minutes intervals
Pros: multiple check supported (HTTP, ping, port…), dashboard with statistics, supports alerts via multiple canals (e-mail, Twitter, Slack, HipChat, push, SMS, web-hook notifications…)
Limitations: Monitoring location cannot be customized

Free tier: Uptime Monitoring: 10 websites, 5 minute intervals, Page Speed Monitoring: 10 websites, 12 hour intervals
Pros: Dashboard with uptime and page speed statistics, paid users are able to invite their whole team at no extra cost, supports alerts via multiple channels (e-mail, Slack)
Limitations: Currently only supports HTTP/HTTPS monitoring, not possible to customise the monitoring location
Exceeding the free tier: Not possible – users aren’t able to add resources beyond the free limits.

Free tier: Public, customizable status page with custom subdomain with SSL
Pros: Includes unlimited components, incident reports and scheduled maintenance. With badges and integrations to showcase system status on users’ website
Limitations: No service monitoring, team members, subscribers, custom domain, only e-mail notifications, Slack manager, sync subscribers with customer service software like Intercom