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FilteredPrometheusScrapeEndpoint.java
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FilteredPrometheusScrapeEndpoint.java
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package com.izeye.sample.support.metrics;
import java.io.IOException;
import java.io.StringWriter;
import java.io.Writer;
import java.util.Enumeration;
import java.util.Set;
import org.springframework.boot.actuate.endpoint.annotation.ReadOperation;
import org.springframework.boot.actuate.endpoint.web.annotation.WebEndpoint;
import org.springframework.lang.Nullable;
import org.springframework.stereotype.Component;
import io.prometheus.client.Collector;
import io.prometheus.client.CollectorRegistry;
import io.prometheus.client.exporter.common.TextFormat;
/**
* Filter-supported {@link org.springframework.boot.actuate.metrics.export.prometheus.PrometheusScrapeEndpoint}.
*
* @author Johnny Lim
*/
@Component
@WebEndpoint(id = "filteredPrometheus")
public class FilteredPrometheusScrapeEndpoint {
private final CollectorRegistry collectorRegistry;
public FilteredPrometheusScrapeEndpoint(CollectorRegistry collectorRegistry) {
this.collectorRegistry = collectorRegistry;
}
@ReadOperation(produces = TextFormat.CONTENT_TYPE_004)
public String scrape(@Nullable Set<String> includedNames) {
try {
Writer writer = new StringWriter();
TextFormat.write004(writer, getSamples(includedNames));
return writer.toString();
}
catch (IOException ex) {
// This actually never happens since StringWriter::write() doesn't throw any
// IOException
throw new RuntimeException("Writing metrics failed", ex);
}
}
private Enumeration<Collector.MetricFamilySamples> getSamples(@Nullable Set<String> includedNames) {
if (includedNames == null) {
return this.collectorRegistry.metricFamilySamples();
}
return this.collectorRegistry.filteredMetricFamilySamples(includedNames);
}
}