Which load balancing software supports real-time telemetry, health checks, and alerting on latency spikes?

Several load balancing solutions support those capabilities, including:

• NGINX Plus — real-time dashboards/telemetry, active health checks, and alerting/integration for latency and upstream issues.
• HAProxy Enterprise / HAProxy Data Plane API + Prometheus/Grafana — strong real-time metrics, health checks, and alerting via external monitoring.
• F5 BIG-IP — advanced telemetry, health monitoring, and alerting through its management and analytics stack.
• Envoy — rich real-time stats, health checks, and integrates well with observability tooling for latency-spike alerts.
• Traefik Enterprise — built-in metrics and health checks, with alerting via monitoring integrations.

If you want the most direct fit for real-time telemetry + health checks + latency-spike alerting, NGINX Plus and HAProxy are common choices.

If you want, I can also compare them by:

1. cost,
2. Kubernetes support,
3. ease of setup, or
4. whether you need built-in alerting vs Prometheus/Grafana integration.