[feature] add metrics tag filter

Add filters for purpose
metric.filter.include[i].name=http_server_requests_seconds
metric.filter.include[i].tags.uri=/auth/login
metric.filter.include[i].tags.method=GET

Author: e-hajizadeh91

tosan-httpserver-spring-boot-starter/src/main/java/com/tosan/http/server/starter/metrics/FilterRule.java

@@ -0,0 +1,29 @@
+package com.tosan.http.server.starter.metrics;
+
+import java.util.HashMap;
+import java.util.Map;
+
+/**
+ * @author Elahe Hajizade
+ * @since 25/12/2025
+ */
+public class FilterRule {
+    private String name;
+    private Map<String, String> tags = new HashMap<>();
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public Map<String, String> getTags() {
+        return tags;
+    }
+
+    public void setTags(Map<String, String> tags) {
+        this.tags = tags;
+    }
+}

tosan-httpserver-spring-boot-starter/src/main/java/com/tosan/http/server/starter/metrics/MeterFilterConfig.java

@@ -3,6 +3,8 @@
 import org.springframework.boot.context.properties.ConfigurationProperties;
 import org.springframework.validation.annotation.Validated;
 
+import java.util.ArrayList;
+import java.util.List;
 import java.util.Map;
 
 /**
@@ -15,6 +17,7 @@ public class MeterFilterConfig {
 
     private String[] excludedMeterNames;
     private Map<String, String> excludedMeterTags;
+    private List<FilterRule> include = new ArrayList<>();
 
     public String[] getExcludedMeterNames() {
         return excludedMeterNames;
@@ -31,4 +34,12 @@ public Map<String, String> getExcludedMeterTags() {
     public void setExcludedMeterTags(Map<String, String> excludedMeterTags) {
         this.excludedMeterTags = excludedMeterTags;
     }
+
+    public List<FilterRule> getInclude() {
+        return include;
+    }
+
+    public void setInclude(List<FilterRule> include) {
+        this.include = include;
+    }
 }

tosan-httpserver-spring-boot-starter/src/main/java/com/tosan/http/server/starter/metrics/MetricFilter.java

@@ -17,6 +17,21 @@ public MetricFilter(MeterFilterConfig meterFilterConfig) {
 
     @Override
     public MeterFilterReply accept(Meter.Id id) {
+
+        if (meterFilterConfig.getInclude() != null) {
+            for (FilterRule rule : meterFilterConfig.getInclude()) {
+
+                if (!id.getName().equals(rule.getName())) continue;
+
+                boolean tagsMatch = rule.getTags().entrySet().stream()
+                        .allMatch(e -> id.getTags().contains(Tag.of(e.getKey(), e.getValue())));
+
+                if (tagsMatch) {
+                    return MeterFilterReply.ACCEPT;
+                }
+            }
+        }
+
         if (meterFilterConfig.getExcludedMeterNames() != null && Arrays.asList(meterFilterConfig.getExcludedMeterNames()).contains(id.getName())) {
             return MeterFilterReply.DENY;
         }