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Use a strong reference to the application shutdown gauge

This commit is contained in:
Chris Eager 2022-02-16 13:58:02 -08:00 committed by Chris Eager
parent 31e2be2e4d
commit a2c4d3fe95
2 changed files with 12 additions and 6 deletions
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2
service/src/main/java/org/whispersystems/textsecuregcm/WhisperServerService.java
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@ -727,7 +727,7 @@ public class WhisperServerService extends Application<WhisperServerConfiguration
environment.healthChecks().register("cacheCluster", new RedisClusterHealthCheck(cacheCluster));
environment.lifecycle().manage(new ApplicationShutdownMonitor());
environment.lifecycle().manage(new ApplicationShutdownMonitor(Metrics.globalRegistry));
environment.metrics().register(name(CpuUsageGauge.class, "cpu"), new CpuUsageGauge(3, TimeUnit.SECONDS));
environment.metrics().register(name(FreeMemoryGauge.class, "free_memory"), new FreeMemoryGauge());

16
service/src/main/java/org/whispersystems/textsecuregcm/metrics/ApplicationShutdownMonitor.java
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@ -5,12 +5,14 @@
package org.whispersystems.textsecuregcm.metrics;
import io.dropwizard.lifecycle.Managed;
import io.micrometer.core.instrument.Metrics;
import java.util.concurrent.atomic.AtomicBoolean;
import static com.codahale.metrics.MetricRegistry.name;
import io.dropwizard.lifecycle.Managed;
import io.micrometer.core.instrument.Gauge;
import io.micrometer.core.instrument.MeterRegistry;
import java.util.concurrent.atomic.AtomicBoolean;
/**
* A managed monitor that reports whether the application is shutting down as a metric. That metric can then be used in
* conjunction with other indicators to conditionally fire or suppress alerts.
@ -19,8 +21,12 @@ public class ApplicationShutdownMonitor implements Managed {
private final AtomicBoolean shuttingDown = new AtomicBoolean(false);
public ApplicationShutdownMonitor() {
Metrics.gauge(name(getClass().getSimpleName(), "shuttingDown"), shuttingDown, b -> b.get() ? 1 : 0);
public ApplicationShutdownMonitor(final MeterRegistry meterRegistry) {
// without a strong reference to the gauge’s value supplier, shutdown garbage collection
// might prevent the final value from being reported
Gauge.builder(name(getClass().getSimpleName(), "shuttingDown"), () -> shuttingDown.get() ? 1 : 0)
.strongReference(true)
.register(meterRegistry);
}
@Override