API latency monitoring that catches slow endpoints
SitePuls helps you detect API response time spikes, not only complete outages.
Why latency matters before downtime
Deployments and database contention often raise response time while HTTP status codes still look healthy.
Synthetic latency from outside
SitePuls measures externally observable response time—what clients and integrations experience.
Alerts when performance crosses your threshold
Route slowdown signals to email, Telegram, or webhooks so the right person investigates.
History for baselines
Stored samples help you compare behavior after releases or infrastructure changes.
Pair with uptime checks
Availability and latency together cover “up but unusable” scenarios.
REST step timing
Multi-step REST monitors record timing per step when flows span login and protected resources.
Not distributed tracing
SitePuls does not replace in-process APM or packet captures—it complements them with scheduled synthetic probes.
Next steps
Start with one slow-prone endpoint, baseline normal latency, then tune alert contacts.
What you can verify with SitePuls here
- Tracks response time trends from scheduled synthetic checks.
- Detects latency spikes that still return success status codes.
- Helps teams separate slowdowns from hard outages.
Where incident alerts can go
- Email addresses saved as alert contacts receive messages when incidents open or resolve (according to your notification settings).
- Telegram notifications via the SitePuls bot after you link a chat to an alert contact (including the bot /start flow for pending contacts).
- HTTPS webhooks that receive JSON with event type, monitor identifiers, status, timestamp, optional incident id, and a short message for generic integrations.
- Slack-compatible incoming-webhook formatting: alert contacts can use a dedicated mode so payloads match Slack-style incoming webhook expectations.
Practical monitoring guide
Example content below is illustrative — values are placeholders, not live customer data.
Latency signals teams watch
- Response time from scheduled synthetic checks — trend over days, not a single spike.
- Threshold alerts when checks exceed the delay your clients tolerate.
- Teams often review percentile views in APM; SitePuls records per-check response time from outside your stack.
How to choose check intervals
- Start with your plan’s allowed minimum for critical APIs, then tune down if noisy.
- Avoid intervals so aggressive that you rate-limit your own endpoint.
- Pair latency checks with uptime status so “up but slow” is visible.
Example slow endpoint alert
Response time alert: GET /api/search exceeded 3.0s threshold (measured 4.2s)
Frequently asked questions
What is API latency monitoring?
It measures how long your API takes to respond and helps detect slow endpoints.
Why monitor latency if the API is still online?
Slow APIs can hurt user experience, conversions and reliability before a full outage happens.
Can I alert on latency spikes?
Yes. SitePuls can help teams react when response time crosses the threshold they care about.
Is this the same as APM?
No—APM instruments processes; SitePuls measures observable latency from scheduled checks.
Can I alert on percentiles?
Configure thresholds and options exposed in the monitor UI for your plan.
Geographic latency?
Use regional checks where your plan includes probe locations.
Combine with heartbeat monitors?
Heartbeats prove jobs ran; latency monitors prove API responsiveness—both help.
Where configured?
Per monitor in SitePuls—intervals and alert contacts attach there.