150
points
1.8
difficulty
0
earned

Website Uptime Monitoring

Category Description

Website uptime monitoring software continuously checks whether websites, APIs, and networked services are reachable and responding correctly, then immediately alerts the responsible team when something goes wrong. The core value proposition is eliminating the scenario in which a service goes down and the team discovers it only after customers complain. Beyond simple up/down detection, these tools track response times over time, verify that the correct content is being served, and monitor supporting infrastructure like SSL certificates. The software gives teams a centralized view of service health, a historical record of availability, and fast, reliable notification across multiple alert channels.

Example Implementations

  • UptimeRobot
  • Better Stack (formerly Better Uptime)
  • Freshping

Target Audience

The primary users are small-to-medium-sized engineering and operations teams — including solo developers, startup technical founders, DevOps engineers, and managed service providers (MSPs) — who are responsible for keeping web-facing services online. Administrators configure monitors and notification routing; individual contributors receive alerts and respond to incidents. The software is typically used in a "set and forget" mode day-to-day, with concentrated activity during outages.

Core Requirements

  1. Monitor creation: Users must be able to create a monitor by providing a target URL or hostname. The system must begin checking the target automatically after creation without requiring additional configuration steps.

  2. HTTP/HTTPS monitoring: The system must support monitoring of HTTP and HTTPS endpoints. The system must treat non-2xx HTTP response codes as a failure condition by default, and must allow users to configure which specific HTTP status codes constitute a passing or failing state.

  3. Ping (ICMP) monitoring: The system must support monitoring of a host via ICMP ping, reporting the host as down if it does not respond within a configurable timeout.

  4. Port (TCP) monitoring: The system must support monitoring of a specific TCP port on a host (e.g., port 25 for SMTP, port 3306 for MySQL), reporting it as down if the port does not accept a connection within a configurable timeout.

  5. Keyword monitoring: The system must support a monitor type that fetches an HTTP/HTTPS URL and checks whether the response body contains (or does not contain) a specified string. The monitor must be reported as down if the keyword condition is not met, even if the HTTP response code is 200.

  6. Configurable check interval: Users must be able to configure how frequently each monitor is checked. The system must support check intervals of at minimum every 5 minutes. Shorter intervals (e.g., 1 minute) may be limited to paid tiers, but 5-minute intervals must be available at the lowest tier.

  7. Downtime alerting: When a monitor transitions from up to down, the system must send an alert. When the monitor recovers, the system must send a recovery notification. Both events must be logged.

  8. Alert channels — email: The system must support sending downtime and recovery alerts via email. Email alerting must be available on the free tier.

  9. Alert channels — webhooks: The system must support outbound webhook notifications for down and recovery events. The webhook payload must include at minimum the monitor name, the affected URL, the event type (down or recovery), and the timestamp.

  10. SSL certificate expiry monitoring: The system must monitor the SSL certificate for any HTTPS monitor and alert users when the certificate is within a configurable number of days of expiration. This must be available without requiring a separate monitor to be configured.

  11. Response time tracking: The system must record the HTTP response time for each check and display a time-series chart of response times for each monitor. The chart must span at least the last 24 hours.

  12. Uptime percentage reporting: The system must calculate and display an uptime percentage for each monitor over configurable time windows (e.g., last 7 days, last 30 days). Downtime periods must be reflected in this calculation.

  13. Incident history: The system must maintain a log of all past incidents for each monitor, including the start time, end time, duration, and root cause or error type where available. Users must be able to view this history from the monitor's detail view.

  14. Dashboard overview: The system must provide a dashboard view that displays the current status (up or down) of all configured monitors at a glance, without requiring the user to navigate to each monitor individually.

  15. Monitor pause and resume: Users must be able to temporarily pause a monitor so that no alerts are sent while it is paused. The system must clearly indicate that a monitor is paused in the dashboard. Users must be able to resume the monitor, at which point normal checking and alerting resumes.

Cross-Cutting Requirements

  1. Multi-tenancy: The application must support multiple independent organizations (tenants), each with isolated data.
  2. Authentication: Users must authenticate with email/password at minimum. SSO and OAuth are not required.
  3. Data persistence: All user data must be persisted across sessions in a database.
  4. Web application: The application must be accessible via a web browser. Native desktop or mobile applications are not required.
  5. Concurrent users: The application must support multiple users within the same tenant using the application simultaneously without data corruption or loss.
  6. Responsive design: The web application must be usable on both desktop and mobile browsers. A native mobile app is not required.

Scope Boundaries

  • Multi-location verification is not required. Confirming a failure from multiple independent geographic locations before alerting reduces false positives but imposes significant infrastructure requirements. Implementations may alert on single-location failures.
  • Third-party team communication integrations are not required. Native integrations with platforms such as Slack, Microsoft Teams, or Discord are present in all example products but are not required here; webhook support (core requirement 9) is sufficient to enable these workflows.
  • Heartbeat (cron job) monitoring is not required. The passive monitor type in which an external process pings a unique URL on a schedule — used to detect failed background jobs or cron tasks — is a distinct feature not universally present on free tiers.
  • Public status page is not required. A publicly accessible page displaying the current and historical status of selected monitors, intended for communication with end-users and customers, is out of scope for this spec.
  • Status page incident communication is not required. The ability to post manual incident update messages visible to status page visitors is out of scope, contingent on the public status page itself being out of scope.
  • Sub-minute check intervals are not required. Intervals of 30 seconds or less exist in paid tiers of some products in this category but are not table stakes.
  • On-call scheduling and escalation policies are not required. The ability to define rotating on-call duty schedules (e.g., "alert Alice on weekdays, Bob on weekends") and multi-step escalation chains is a more advanced incident management feature present in some products (particularly Better Stack) but not all.
  • Maintenance windows are not required. The ability to schedule a time window during which no alerts are sent (to suppress noise during planned deployments) is a paid feature in multiple products in this category.
  • Transaction (synthetic) monitoring is not required. Multi-step browser-based checks that simulate user flows (e.g., log in, add to cart, complete checkout) go beyond basic uptime monitoring and are typically sold as a separate or premium feature.
  • Real User Monitoring (RUM) is not required. Collecting performance data from actual users' browsers is a distinct monitoring category.
  • DNS monitoring is not required as a standalone check type. DNS resolution checks (verifying that a domain resolves to an expected IP) appear in some products but not all.
  • UDP port monitoring is not required. TCP port monitoring is table stakes; UDP is a less common check type not universally supported.
  • API for monitor management is not required. Programmatic creation, updating, and deletion of monitors via a REST API is a useful developer feature but is not present in all free tiers.
  • Log management and aggregation are not required. Centralized log ingestion, parsing, and search (a significant feature in Better Stack's broader platform) is a separate product category.
  • Error tracking and APM are not required. Application performance monitoring, distributed tracing, and error tracking are adjacent but distinct categories.
  • Phone call and SMS alerts are not required. Voice call alerting for critical incidents is a differentiating feature in some products and is typically behind a paid tier. SMS is also often paywalled or credit-based.
  • Team member invitation and access management beyond basic multi-tenancy are not required. Fine-grained role permissions, per-monitor access controls, and seat-based team management are features that vary significantly across pricing tiers.
  • Incident root cause screenshots are not required. Automatically capturing a screenshot of a failing page at the moment of detection is a specific feature of some products (e.g., Better Stack) but not universal.
  • Apdex scoring is not required. Computing and displaying an Application Performance Index score is a specific reporting feature present in Freshping but not universally offered.
  • Global latency maps are not required. Visualizing response times by geographic region on a world map is a premium reporting feature in some products.
  • White-label / reseller mode is not required. The ability to run the tool under a fully custom brand for resale to third-party clients is an enterprise feature outside the scope of this spec.

Spec Metadata

  • Version: 1.0
  • Created: 2026-03-17
  • Last Updated: 2026-03-17
  • Status: Draft
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