Metrics Enpoint triggers "counters cannot have a negative value"

[kmoens]

I experienced this issue with Dependency Track and reported it as DependencyTrack/dependency-track#5534, and have been asked to report it here.

When I attempt to access the /metrics enpoint, which I enabled using the ALPINE_METRICS_ENABLED=true environment variable, I get the following exception:

2025-11-14 10:36:53,627 [] WARN [org.eclipse.jetty.ee10.servlet.ServletChannel] /dtrack-api/metrics
java.lang.IllegalArgumentException: -3.7346281E7: counters cannot have a negative value
	at io.prometheus.metrics.model.snapshots.CounterSnapshot$CounterDataPointSnapshot.validate(CounterSnapshot.java:78)
	at io.prometheus.metrics.model.snapshots.CounterSnapshot$CounterDataPointSnapshot.<init>(CounterSnapshot.java:64)
	at io.prometheus.metrics.model.snapshots.CounterSnapshot$CounterDataPointSnapshot.<init>(CounterSnapshot.java:46)
	at io.micrometer.prometheusmetrics.PrometheusMeterRegistry.lambda$newFunctionCounter$20(PrometheusMeterRegistry.java:380)
	at io.micrometer.prometheusmetrics.MicrometerCollector.collect(MicrometerCollector.java:77)
	at io.prometheus.metrics.model.registry.PrometheusRegistry.scrape(PrometheusRegistry.java:84)
	at io.prometheus.metrics.model.registry.PrometheusRegistry.scrape(PrometheusRegistry.java:66)
	at io.micrometer.prometheusmetrics.PrometheusMeterRegistry.scrape(PrometheusMeterRegistry.java:166)
	at io.micrometer.prometheusmetrics.PrometheusMeterRegistry.scrape(PrometheusMeterRegistry.java:154)
	at alpine.server.servlets.MetricsServlet.doGet(MetricsServlet.java:78)
	at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:633)
	at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:723)
	at org.eclipse.jetty.ee10.servlet.ServletHolder$NotAsync.service(ServletHolder.java:1379)
	at org.eclipse.jetty.ee10.servlet.ServletHolder.handle(ServletHolder.java:736)
	at org.eclipse.jetty.ee10.servlet.ServletHandler$ChainEnd.doFilter(ServletHandler.java:1621)
	at alpine.server.filters.ContentSecurityPolicyFilter.doFilter(ContentSecurityPolicyFilter.java:225)
	at org.eclipse.jetty.ee10.servlet.FilterHolder.doFilter(FilterHolder.java:205)
	at org.eclipse.jetty.ee10.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1593)
	at alpine.server.filters.ClickjackingFilter.doFilter(ClickjackingFilter.java:93)
	at org.eclipse.jetty.ee10.servlet.FilterHolder.doFilter(FilterHolder.java:205)
	at org.eclipse.jetty.ee10.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1593)
	at alpine.server.filters.WhitelistUrlFilter.doFilter(WhitelistUrlFilter.java:166)
	at org.eclipse.jetty.ee10.servlet.FilterHolder.doFilter(FilterHolder.java:208)
	at org.eclipse.jetty.ee10.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1593)
	at org.eclipse.jetty.ee10.servlet.ServletHandler$MappedServlet.handle(ServletHandler.java:1554)
	at org.eclipse.jetty.ee10.servlet.ServletChannel.dispatch(ServletChannel.java:819)
	at org.eclipse.jetty.ee10.servlet.ServletChannel.handle(ServletChannel.java:436)
	at org.eclipse.jetty.ee10.servlet.ServletHandler.handle(ServletHandler.java:469)
	at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:575)
	at org.eclipse.jetty.ee10.servlet.SessionHandler.handle(SessionHandler.java:717)
	at org.eclipse.jetty.server.handler.ContextHandler.handle(ContextHandler.java:1064)
	at org.eclipse.jetty.server.Server.handle(Server.java:182)
	at org.eclipse.jetty.server.internal.HttpChannelState$HandlerInvoker.run(HttpChannelState.java:662)
	at org.eclipse.jetty.server.internal.HttpConnection.onFillable(HttpConnection.java:416)
	at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:322)
	at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:99)
	at org.eclipse.jetty.io.SelectableChannelEndPoint$1.run(SelectableChannelEndPoint.java:53)
	at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.runTask(AdaptiveExecutionStrategy.java:480)
	at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.consumeTask(AdaptiveExecutionStrategy.java:443)
	at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.tryProduce(AdaptiveExecutionStrategy.java:293)
	at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.run(AdaptiveExecutionStrategy.java:201)
	at org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:311)
	at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:979)
	at org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.doRunJob(QueuedThreadPool.java:1209)
	at org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.run(QueuedThreadPool.java:1164)
	at java.base/java.lang.Thread.run(Unknown Source)