Metrics & Analytics

можно. collects feature flag usage metrics: how many times a flag was evaluated and what result it returned. Metrics are visualized in the web dashboard via sparkline charts and accessible through the REST API.

How Metrics Are Collected

The SDK accumulates true/false counters for each flag in memory and sends them to the server in a single request at a configurable interval (default: 60 seconds):

sequenceDiagram
    participant App as Application
    participant SDK as SDK
    participant Server

    loop Each isEnabled()
        App->>SDK: isEnabled("flag", ctx)
        Note over SDK: trueCount++ or falseCount++
    end

    Note over SDK: Interval elapsed:<br/>snapshot buffer,<br/>clear buffer

    SDK->>Server: POST /api/client/metrics<br/>{flag: {t: 150, f: 50}}

    alt Success
        Note over Server: Saves to flag_metrics<br/>aggregating into hourly buckets
    else Network error
        Note over SDK: Merges counters<br/>back into buffer
    end

Each record contains:

Field	Description
flagId	Flag ID
environmentId	Environment ID
evaluationTrueCount	Number of true returns
evaluationFalseCount	Number of false returns
timeBucket	Hourly interval
instanceId	SDK instance identifier
appName	Application name

Viewing Metrics in the Dashboard

Each flag page displays a sparkline chart — a miniature graph showing the flag's evaluation trend over the selected period. The green line represents true, the gray line false.

Clicking the sparkline opens a dialog with a full chart and a list of SDK instances grouped by application. Filter by application name and specific instance. Metrics are retained for the last 48 hours.

Disabling Metrics

If metrics are not needed, disable them in the SDK:

MozhnoConfig config = MozhnoConfig.builder()
    .appName("my-app")
    .instanceId("instance-1")
    .mozhnoUrl("http://localhost:8080")
    .apiKey("<api-key>")
    .disableMetrics(true)
    .build();

Interpreting Metrics

Pattern	Interpretation
trueCount is growing	The flag is being enabled for more users — rollout is working
falseCount is growing, trueCount = 0	Flag is off or no one matches the targeting rules
Sudden spike in falseCount	Possible issue: flag suddenly stopped being enabled
No metrics at all	SDK is not sending data — check connectivity

Limits

Default 60 seconds.

Related Pages

• SDK Overview — how SDK sends metrics
• Monitoring — Prometheus, health checks
• Targeting — rules and segments