Alert Types

VitalSentinel supports alerts across all monitoring modules. This guide covers every available alert type and when to use them.

Uptime Alerts

Uptime Monitoring alerts use predefined configurations. Select from these available alert types:

Available Presets

RUM Alerts

RUM Monitoring tracks real user performance metrics. See Performance Thresholds for detailed rating breakdowns.

LCP (Largest Contentful Paint)

Example:

If LCP p75 > 2500ms → Warning
If LCP p75 > 4000ms → Critical

CLS (Cumulative Layout Shift)

Example:

If CLS p75 > 0.1 → Warning
If CLS p75 > 0.25 → Critical

INP (Interaction to Next Paint)

Example:

If INP p75 > 200ms → Warning
If INP p75 > 500ms → Critical

TTFB (Time to First Byte)

Example:

If TTFB p75 > 800ms → Warning

FCP (First Contentful Paint)

Example:

If FCP p75 > 1800ms → Warning

Error Rate

Percentage of page views with JavaScript errors.

Example:

If Error Rate > 5% → Warning

CrUX Alerts

CrUX Monitoring tracks Chrome User Experience Report data with custom threshold alerts.

Available Metrics

Configuration Options

• URL/Origin: Monitor specific URL or entire origin
• Device: Any, Phone, or Desktop

Example:

If LCP p75 > 2500ms (Origin, Any device) → Warning
If INP p75 > 200ms (Origin, Phone) → Warning

Synthetic Alerts

Synthetic Monitoring runs Lighthouse tests with custom thresholds.

Available Metrics

Configuration Options

• URL: Select which monitored URL to track
• Device: Any, Phone, or Desktop
• Evaluation Window: Average of last 1, 3, 5, or 10 tests

Example:

If LCP > 2500ms (avg last 5 tests) → Warning
If TBT > 200ms (avg last 3 tests) → Warning
If CLS > 0.1 (last test) → Critical

Robots.txt Alerts

Robots.txt Monitoring alerts use predefined configurations. Select from these available alert types:

Available Presets

Search & Traffic Alerts (Percentage Change)

Google Search Console, Indexing, Web Analytics, and Google Analytics alerts don't use fixed thresholds. Instead, they compare the current period against the previous one and trigger on relative change. These modules support three operators:

Each rule takes a comparison window (1, 3, 7, 14, or 28 days) that sets both the current period and the baseline it is compared against.

Google Search Console

Example:

If Clicks decreased by more than 30% (7-day window) → Warning

Indexing

Alerts on the number of pages in each Google index-coverage state (Submitted and indexed, Crawled - currently not indexed, Discovered - currently not indexed, Not found (404), Server error (5xx), Blocked by robots.txt, and more).

Example:

If "Submitted and indexed" decreased by more than 15% (7-day window) → Critical

Web Analytics

Example:

If Visitors decreased by more than 30% (7-day window) → Warning

Google Analytics

Example:

If Users decreased by more than 30% (7-day window) → Warning

Recommended Alert Sets

Use the Create essential alerts with one click feature on the Alerts page to automatically create these recommended alerts across every module.

What Gets Created

RUM Monitoring (p75 within last 24h, Warning, in-app only):

• LCP > 2.5s
• CLS > 0.1
• INP > 200ms

CrUX Monitoring (p75 within last 7 days, Origin, Warning, in-app only):

• LCP > 2.5s
• CLS > 0.1
• INP > 200ms

Synthetic Monitoring (Home URL, avg of last 5 tests, Warning, in-app only):

• LCP > 2.5s
• CLS > 0.1

Uptime Monitoring (with email):

• Site is down (Critical)
• Site is up / recovery (Critical)
• SSL will expire in 14 days (Warning) and 7 days (Critical)
• Domain will expire in 14 days (Warning) and 7 days (Critical)

Robots.txt Monitoring:

• Has syntax errors (Critical, with email)
• Blocks sitemap URLs (Warning, with email)
• File changed (Info, in-app only)

Google Search Console (% change over 7 days, Warning, in-app only):

• Clicks dropped > 30%
• Impressions dropped > 30%

Indexing Monitoring (% change over 7 days, Critical, in-app only):

• Indexed pages dropped > 15%

Web Analytics (% change over 7 days, Warning, in-app only):

• Visitors dropped > 30%

Google Analytics (% change over 7 days, Warning, in-app only):

• Users dropped > 30%

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