Http Azure Function misses "Server Requests" metric occasionally

Azure Functions emit platform metrics such as Requests, Response Time, Data In/Out, and HTTP status–based counters (Http2xx, Http4xx, Http5xx, etc.) through Azure Monitor. These metrics are collected at fixed time grains (typically 1 minute) and are aggregated per instance.

Because metrics are sampled and aggregated, short gaps or apparent “missing” points in a chart of Server requests (or similar metrics) can occur when:

• No executions or HTTP requests are processed on a given instance during a specific time grain.
• The function host is unloaded or scaled down, so there is no active process emitting metrics for that interval.

In such cases, the chart can show intermittent drops to zero or missing points even though the function is generally healthy. This behavior is expected for auto‑scaled, event‑driven workloads.

To understand utilization and health more completely, combine the Server requests metric with other Azure Functions metrics such as Function Execution Count, Data In/Out, and Response Time, and correlate with Application Insights telemetry.

References:

• Azure Functions monitoring data reference
• Monitor Azure Functions and Event Hubs
• Supported metrics for managed Functions in Azure Static Web Apps