Synthetisches Monitoring

How Synthetic Monitoring Works

Synthetic monitoring executes scripted interactions against a service on a schedule, independent of real user traffic. Probes can range from simple PingA network utility that sends ICMP echo request packets to a target host and measures the round-trip time (RTT) of the reply. The most basic tool for testing network reachability and measuring latency. or DNSDomain Name System. The hierarchical, distributed naming system that translates human-readable domain names (e.g., example.com) into IP addresses (e.g., 93.184.216.34). Often called the "phonebook of the internet." resolution checks to full browser-driven flows that simulate login, search, and checkout. Results are compared against baselines, and deviations trigger alerts. Because probes run continuously and from fixed locations, they provide consistent, repeatable measurements unaffected by fluctuations in real user behavior.

Use Cases

Synthetic monitoring excels at detecting issues before users do. An HTTPS probe checking certificate validity catches SSL/TLSSecure Sockets Layer / Transport Layer Security. Cryptographic protocols that provide encrypted, authenticated communication over a network. SSL is deprecated; modern implementations use TLS 1.2 or TLS 1.3. expiry days in advance. A transaction probe that mimics a login flow detects application-layer regressions that infrastructure metrics miss entirely. Geographic distribution of probe nodes reveals regional LatencyThe time delay for a data packet to travel from source to destination, typically measured in milliseconds (ms). Lower latency is critical for real-time applications like video calls, gaming, and financial trading. differences caused by CDNContent Delivery Network. A geographically distributed network of servers that caches and serves content from locations close to end users, reducing latency and improving load times. Major providers include Cloudflare, AWS CloudFront, and Akamai. misconfiguration or ISPInternet Service Provider. A company that provides internet access to consumers and businesses, assigning public IP addresses and routing traffic to the wider internet. Examples include Comcast, AT&T, and SK Broadband. routing changes. It also provides the objective measurement data needed to report against SLAService Level Agreement. A formal contract between a service provider and customer that defines measurable performance guarantees such as uptime percentage (e.g., 99.99%), response time, and remediation credits for breaches. commitments.

Complementing Real-User Monitoring

Synthetic monitoring and real-user monitoring (RUM) are complementary. Synthetic probes give consistent, always-on coverage including during low-traffic periods when real-user signals are sparse. RUM captures the actual experience across diverse devices, networks, and locations. Together they feed into ObservabilityThe ability to understand a system's internal state from its external outputs, built on three pillars: metrics (numeric measurements), logs (event records), and traces (request paths). Goes beyond traditional monitoring by enabling root cause analysis. platforms, where GrafanaAn open-source analytics and visualization platform that creates dashboards from time-series data sources like Prometheus, InfluxDB, and Elasticsearch. Widely used for monitoring infrastructure, applications, and business metrics. dashboards display synthetic probe results alongside application metrics from PrometheusAn open-source systems monitoring and alerting toolkit that collects time-series metrics via a pull model over HTTP. Its powerful query language (PromQL) and integration with Grafana make it a standard for cloud-native monitoring.. Ping Test provides an ad-hoc equivalent of a basic synthetic probe for quick connectivity checks.