wip

kafka-ui-api/src/main/java/com/provectus/kafka/ui/config/auth/AbstractAuthSecurityConfig.java

@@ -17,7 +17,8 @@ abstract class AbstractAuthSecurityConfig {
       "/login",
       "/logout",
       "/oauth2/**",
-      "/static/**"
+      "/static/**",
+      "/api/clusters/**/prometheus/expose/**"
   };
 
 }

kafka-ui-api/src/main/java/com/provectus/kafka/ui/controller/AbstractController.java

@@ -7,7 +7,7 @@ import org.springframework.beans.factory.annotation.Autowired;
 
 public abstract class AbstractController {
 
-  private ClustersStorage clustersStorage;
+  protected ClustersStorage clustersStorage;
 
   protected KafkaCluster getCluster(String name) {
     return clustersStorage.getClusterByName(name)

kafka-ui-api/src/main/java/com/provectus/kafka/ui/controller/PrometheusExposeController.java

@@ -7,7 +7,7 @@ import com.provectus.kafka.ui.api.PrometheusExposeApi;
 import com.provectus.kafka.ui.service.StatisticsCache;
 import io.prometheus.client.exporter.common.TextFormat;
 import java.io.StringWriter;
-import java.io.Writer;
+import java.util.ArrayList;
 import java.util.List;
 import java.util.stream.Stream;
 import lombok.RequiredArgsConstructor;
@@ -25,11 +25,16 @@ public class PrometheusExposeController extends AbstractController implements Pr
   private final StatisticsCache statisticsCache;
 
   @Override
-  public Mono<ResponseEntity<String>> getAllMetrics(String clusterName, ServerWebExchange exchange) {
+  public Mono<ResponseEntity<String>> getAllMetrics(ServerWebExchange exchange) {
+    return constructResponse(getSummarizedMetricsWithClusterLbl());
+  }
+
+  @Override
+  public Mono<ResponseEntity<String>> getAllClusterMetrics(String clusterName, ServerWebExchange exchange) {
     return constructResponse(
         statisticsCache.get(getCluster(clusterName))
             .getMetrics()
-            .getSummarizedBrokersMetrics()
+            .getSummarizedMetrics()
     );
   }
 
@@ -37,6 +42,7 @@ public class PrometheusExposeController extends AbstractController implements Pr
   public Mono<ResponseEntity<String>> getBrokerMetrics(String clusterName,
                                                        Long brokerId,
                                                        ServerWebExchange exchange) {
+    //TODO: discuss - do we need to append broker_id lbl ?
     return constructResponse(
         statisticsCache.get(getCluster(clusterName))
             .getMetrics()
@@ -46,9 +52,42 @@ public class PrometheusExposeController extends AbstractController implements Pr
     );
   }
 
+  private Stream<MetricFamilySamples> getSummarizedMetricsWithClusterLbl() {
+    return clustersStorage.getKafkaClusters()
+        .stream()
+        .flatMap(c -> statisticsCache.get(c)
+            .getMetrics()
+            .getSummarizedMetrics()
+            .map(mfs -> appendClusterLbl(mfs, c.getName())));
+  }
+
+  private static MetricFamilySamples appendClusterLbl(MetricFamilySamples mfs, String clusterName) {
+    return new MetricFamilySamples(
+        mfs.name,
+        mfs.unit,
+        mfs.type,
+        mfs.help,
+        mfs.samples.stream()
+            .map(sample ->
+                new MetricFamilySamples.Sample(
+                    sample.name,
+                    prependToList(sample.labelNames, "cluster"),
+                    prependToList(sample.labelValues, clusterName),
+                    sample.value
+                )).toList()
+    );
+  }
+
+  private static <T> List<T> prependToList(List<T> lst, T toPrepend) {
+    var result = new ArrayList<T>(lst.size() + 1);
+    result.add(toPrepend);
+    result.addAll(lst);
+    return result;
+  }
+
   @SneakyThrows
-  private Mono<ResponseEntity<String>> constructResponse(Stream<MetricFamilySamples> metrics) {
-    Writer writer = new StringWriter();
+  private static Mono<ResponseEntity<String>> constructResponse(Stream<MetricFamilySamples> metrics) {
+    StringWriter writer = new StringWriter();
     TextFormat.writeOpenMetrics100(writer, Iterators.asEnumeration(metrics.iterator()));
 
     HttpHeaders responseHeaders = new HttpHeaders();

kafka-ui-api/src/main/java/com/provectus/kafka/ui/mapper/ClusterMapper.java

@@ -32,10 +32,7 @@ import com.provectus.kafka.ui.model.ReplicaDTO;
 import com.provectus.kafka.ui.model.TopicConfigDTO;
 import com.provectus.kafka.ui.model.TopicDTO;
 import com.provectus.kafka.ui.model.TopicDetailsDTO;
-import com.provectus.kafka.ui.service.metrics.RawMetric;
-import io.prometheus.client.Collector;
 import java.math.BigDecimal;
-import java.util.Collection;
 import java.util.List;
 import java.util.Map;
 import java.util.stream.Collectors;
@@ -62,7 +59,7 @@ public interface ClusterMapper {
   @Deprecated
   default ClusterMetricsDTO toClusterMetrics(Metrics metrics) {
     return new ClusterMetricsDTO()
-        .items(convert(metrics.getSummarizedBrokersMetrics()).toList());
+        .items(convert(metrics.getSummarizedMetrics()).toList());
   }
 
   private Stream<MetricDTO> convert(Stream<MetricFamilySamples> metrics) {

kafka-ui-api/src/main/java/com/provectus/kafka/ui/model/Metrics.java

@@ -47,7 +47,7 @@ public class Metrics {
     }
   }
 
-  public Stream<MetricFamilySamples> getSummarizedBrokersMetrics() {
+  public Stream<MetricFamilySamples> getSummarizedMetrics() {
     return Streams.concat(
         inferredMetrics.asList().stream(),
         perBrokerScrapedMetrics

kafka-ui-api/src/main/java/com/provectus/kafka/ui/service/metrics/scrape/WellKnownMetrics.java → kafka-ui-api/src/main/java/com/provectus/kafka/ui/service/metrics/scrape/IoRatesMetricsScanner.java

@@ -10,9 +10,8 @@ import java.math.BigDecimal;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
-import org.apache.kafka.common.Node;
 
-public class WellKnownMetrics {
+public class IoRatesMetricsScanner {
 
   // per broker
   final Map<Integer, BigDecimal> brokerBytesInFifteenMinuteRate = new HashMap<>();
@@ -22,7 +21,7 @@ public class WellKnownMetrics {
   final Map<String, BigDecimal> bytesInFifteenMinuteRate = new HashMap<>();
   final Map<String, BigDecimal> bytesOutFifteenMinuteRate = new HashMap<>();
 
-  public WellKnownMetrics(Map<Integer, List<Collector.MetricFamilySamples>> perBrokerMetrics) {
+  public IoRatesMetricsScanner(Map<Integer, List<Collector.MetricFamilySamples>> perBrokerMetrics) {
     perBrokerMetrics.forEach((nodeId, metrics) -> {
       metrics.forEach(m -> {
         RawMetric.create(m).forEach(rawMetric -> {
@@ -33,7 +32,7 @@ public class WellKnownMetrics {
     });
   }
 
-  public Metrics.IoRates ioRates() {
+  public Metrics.IoRates get() {
     return Metrics.IoRates.builder()
         .topicBytesInPerSec(bytesInFifteenMinuteRate)
         .topicBytesOutPerSec(bytesOutFifteenMinuteRate)

kafka-ui-api/src/main/java/com/provectus/kafka/ui/service/metrics/scrape/PerBrokerScrapedMetrics.java

@@ -18,8 +18,7 @@ public class PerBrokerScrapedMetrics {
   }
 
   Metrics.IoRates ioRates() {
-    //TODO: rename WKMetrics
-    return new WellKnownMetrics(perBrokerMetrics).ioRates();
+    return new IoRatesMetricsScanner(perBrokerMetrics).get();
   }
 
 }

kafka-ui-api/src/main/java/com/provectus/kafka/ui/service/metrics/scrape/inferred/InferredMetricsScraper.java

@@ -101,7 +101,7 @@ public class InferredMetricsScraper {
               state.logDirSpaceStats().totalBytes()
           );
         }
-        //TODO: maybe add per-directory stats also
+        //TODO: maybe add per-directory stats also?
       }
     });
   }

kafka-ui-api/src/test/java/com/provectus/kafka/ui/service/metrics/scrape/WellKnownMetricsTest.java → kafka-ui-api/src/test/java/com/provectus/kafka/ui/service/metrics/scrape/IoRatesMetricsScannerTest.java

@@ -6,9 +6,9 @@ import java.math.BigDecimal;
 import org.apache.kafka.common.Node;
 import org.junit.jupiter.api.Test;
 
-class WellKnownMetricsTest {
+class IoRatesMetricsScannerTest {
 
-  private WellKnownMetrics wellKnownMetrics;
+  private IoRatesMetricsScanner ioRatesMetricsScanner;
 
   @Test
   void bytesIoTopicMetricsPopulated() {
@@ -21,9 +21,9 @@ class WellKnownMetricsTest {
         "some_unknown_prefix_brokertopicmetrics_fifteenminuterate{name=\"bytesinpersec\",topic=\"test-topic\",} 1.0",
         "some_unknown_prefix_brokertopicmetrics_fifteenminuterate{name=\"bytesoutpersec\",topic=\"test-topic\",} 2.0"
     );
-    assertThat(wellKnownMetrics.bytesInFifteenMinuteRate)
+    assertThat(ioRatesMetricsScanner.bytesInFifteenMinuteRate)
         .containsEntry("test-topic", new BigDecimal("3.0"));
-    assertThat(wellKnownMetrics.bytesOutFifteenMinuteRate)
+    assertThat(ioRatesMetricsScanner.bytesOutFifteenMinuteRate)
         .containsEntry("test-topic", new BigDecimal("6.0"));
   }
 
@@ -40,12 +40,12 @@ class WellKnownMetricsTest {
         "some_unknown_prefix_brokertopicmetrics_fifteenminuterate{name=\"bytesoutpersec\",} 20.0"
     );
 
-    assertThat(wellKnownMetrics.brokerBytesInFifteenMinuteRate)
+    assertThat(ioRatesMetricsScanner.brokerBytesInFifteenMinuteRate)
         .hasSize(2)
         .containsEntry(1, new BigDecimal("1.0"))
         .containsEntry(2, new BigDecimal("10.0"));
 
-    assertThat(wellKnownMetrics.brokerBytesOutFifteenMinuteRate)
+    assertThat(ioRatesMetricsScanner.brokerBytesOutFifteenMinuteRate)
         .hasSize(2)
         .containsEntry(1, new BigDecimal("2.0"))
         .containsEntry(2, new BigDecimal("20.0"));

kafka-ui-contract/src/main/resources/swagger/kafka-ui-api.yaml

@@ -157,6 +157,66 @@ paths:
               schema:
                 $ref: '#/components/schemas/ClusterMetrics'
 
+  /api/prometheus/expose/all:
+    get:
+      tags:
+        - PrometheusExpose
+      summary: getAllMetrics
+      operationId: getAllMetrics
+      responses:
+        200:
+          description: OK
+          content:
+            application/text:
+              schema:
+                type: string
+
+  /api/clusters/{clusterName}/prometheus/expose/all:
+    get:
+      tags:
+        - PrometheusExpose
+      summary: getAllClusterMetrics
+      operationId: getAllClusterMetrics
+      parameters:
+        - name: clusterName
+          in: path
+          required: true
+          schema:
+            type: string
+      responses:
+        200:
+          description: OK
+          content:
+            application/text:
+              schema:
+                type: string
+
+  /api/clusters/{clusterName}/prometheus/expose/broker/{brokerId}:
+    get:
+      tags:
+        - PrometheusExpose
+      summary: getBrokerMetrics
+      operationId: getBrokerMetrics
+      parameters:
+        - name: clusterName
+          in: path
+          required: true
+          schema:
+            type: string
+        - name: brokerId
+          in: path
+          required: true
+          schema:
+            type: integer
+            format: int64
+      responses:
+        200:
+          description: OK
+          content:
+            application/text:
+              schema:
+                type: string
+
   /api/clusters/{clusterName}/stats:
     get:
       tags: