README.md

System Info

This project uses a filter to add CPU and memory system information fields to the logger context on every logger call, using OSHI.

You can see the additional fields in the application.ndjson file.

public class SystemInfoFilter implements CoreLoggerFilter {

  private final SystemInfo systemInfo;

  public SystemInfoFilter() {
    systemInfo = new SystemInfo();
  }

  @Override
  public CoreLogger apply(CoreLogger coreLogger) {
    HardwareAbstractionLayer hardware = systemInfo.getHardware();
    GlobalMemory mem = hardware.getMemory();
    CentralProcessor proc = hardware.getProcessor();
    double[] loadAverage = proc.getSystemLoadAverage(3);

    // Now you can add conditions based on these fields, and conditionally
    // enable logging based on your load and memory!
    return coreLogger.withFields(
        fb -> {
          Field loadField =
              fb.object(
                  "load_average", //
                  fb.number("1min", loadAverage[0]), //
                  fb.number("5min", loadAverage[1]), //
                  fb.number("15min", loadAverage[2]));
          Field memField =
              fb.object(
                  "mem", //
                  fb.number("available", mem.getAvailable()), //
                  fb.number("total", mem.getTotal()));
          Field sysinfoField = fb.object("sysinfo", loadField, memField);
          return fb.only(sysinfoField);
        },
        Field.Builder.instance());
  }
}