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Statistics Objects always return null despite change in container stats #2383

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DeshyDan opened this issue Mar 3, 2025 · 0 comments
Open

Statistics Objects always return null despite change in container stats #2383

DeshyDan opened this issue Mar 3, 2025 · 0 comments

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@DeshyDan
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DeshyDan commented Mar 3, 2025

Description

When calling getContainerStats(String containerId), the Statistics object returned is null, even though the logs show a value. Specifically, when calling cpuUsage.getTotalUsage(), the function returns null, but the log output suggests that a value is present.

Code Sample

Here is the code used to retrieve container stats:

public Statistics getContainerStats(String containerId) {  
    InvocationBuilder.AsyncResultCallback<Statistics> callback = new InvocationBuilder.AsyncResultCallback<>();  
    dockerClient.statsCmd(containerId).exec(callback);  
    Statistics stats;  
    try {  
        stats = callback.awaitResult();  
        callback.close();  
    } catch (IOException e) {  
        log.error("Failed to get container stats: {}", containerId, e);  
        throw new RuntimeException("Failed to get container stats", e);  
    }  
    return stats;  
}

To fetch CPU usage:

private long getTotalCpuUsage(CpuStatsConfig cpuStats) {  
    CpuUsageConfig cpuUsage = cpuStats.getCpuUsage();  
    log.info("Total CPU usage: {}", cpuUsage.getTotalUsage());  
    return cpuUsage.getTotalUsage();  
}

Observed Behavior

  • The cpuUsage.getTotalUsage() method always returns null.
  • However, the log statement log.info("Total CPU usage: {}", cpuUsage.getTotalUsage()); correctly displays a value.

Expected Behavior

  • cpuUsage.getTotalUsage() should return the same value as seen in the logs.
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@DeshyDan