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export Membrane Version as Prometheus metric #2795

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Merged
predic8 merged 1 commit into from
Feb 23, 2026
Merged

export Membrane Version as Prometheus metric #2795

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6 changes: 6 additions & 0 deletions ...src/main/java/com/predic8/membrane/core/interceptor/prometheus/PrometheusInterceptor.java
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Original file line number Diff line number Diff line change
Expand Up @@ -29,6 +29,7 @@
import java.util.concurrent.*;
import java.util.regex.*;

import static com.predic8.membrane.annot.Constants.VERSION;
import static com.predic8.membrane.core.http.Response.*;
import static com.predic8.membrane.core.interceptor.Outcome.*;
import static com.predic8.membrane.core.interceptor.balancer.BalancerUtil.*;
Expand Down Expand Up @@ -126,6 +127,7 @@ private void collect() {
private void buildPrometheusStyleResponse(Context ctx) {
ctx.resetAll();
ctx.reset();
buildVersionLine(ctx);
for (Proxy r : router.getRuleManager().getRules()) {
if (!ctx.seenRules.add(prometheusCompatibleName(r.getName()))) {
// the prometheus format is not allowed to contain the same metric more than once
Expand Down Expand Up @@ -159,6 +161,10 @@ private void buildPrometheusStyleResponse(Context ctx) {

}

private void buildVersionLine(Context ctx) {
ctx.count.append("membrane_info{version=\"" + prometheusCompatibleName(VERSION) + "\"} 1\n");
}

private void buildLoadBalancerLines(Context ctx) {
ctx.lb_active_nodes.append("# TYPE membrane_lb_node_status gauge\n");
for (Cluster cl : collectClusters(router)) {
Expand Down
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