Azure Events Hub support fixed (#3540)

 UnknownTopicOrPartitionException error suppressing added when calling describeConfigs() for brokers (Azure case).

Co-authored-by: iliax <[email protected]>

Author: iliax

kafka-ui-api/src/main/java/com/provectus/kafka/ui/service/ReactiveAdminClient.java

@@ -212,17 +212,24 @@ private static Mono<Map<Integer, List<ConfigEntry>>> loadBrokersConfig(AdminClie
         .map(brokerId -> new ConfigResource(ConfigResource.Type.BROKER, Integer.toString(brokerId)))
         .collect(toList());
     return toMono(client.describeConfigs(resources).all())
-        // some kafka backends (like MSK serverless) do not support broker's configs retrieval,
-        // in that case InvalidRequestException will be thrown
-        .onErrorResume(InvalidRequestException.class, th -> {
-          log.trace("Error while getting broker {} configs", brokerIds, th);
-          return Mono.just(Map.of());
-        })
+        // some kafka backends don't support broker's configs retrieval,
+        // and throw various exceptions on describeConfigs() call
+        .onErrorResume(th -> th instanceof InvalidRequestException // MSK Serverless
+                || th instanceof UnknownTopicOrPartitionException, // Azure event hub
+            th -> {
+              log.trace("Error while getting configs for brokers {}", brokerIds, th);
+              return Mono.just(Map.of());
+            })
         // there are situations when kafka-ui user has no DESCRIBE_CONFIGS permission on cluster
         .onErrorResume(ClusterAuthorizationException.class, th -> {
           log.trace("AuthorizationException while getting configs for brokers {}", brokerIds, th);
           return Mono.just(Map.of());
         })
+        // catching all remaining exceptions, but logging on WARN level
+        .onErrorResume(th -> true, th -> {
+          log.warn("Unexpected error while getting configs for brokers {}", brokerIds, th);
+          return Mono.just(Map.of());
+        })
         .map(config -> config.entrySet().stream()
             .collect(toMap(
                 c -> Integer.valueOf(c.getKey().name()),