[Feature] Support datasource metrics analysis

CHANGES.md

@@ -55,15 +55,18 @@ Release Notes.
 * Add Guava EventBus component ID(123) of Java agent.
 * Add OpenFunction component ID(5013).
 * Expose configuration `responseTimeout` of ES client.
+* Support datasource metric analysis.
 
 #### UI
 
 * Remove unused jars (log4j-api.jar) in classpath.
 * Bump up netty version to fix CVE.
+* add Database Connection pool metric.
 
 #### Documentation
 
 * update backend-alarm.md doc, support op "=" to "==".
+* update backend-meter.md doc .
 
 All issues and pull requests are [here](https://github.com/apache/skywalking/milestone/112?closed=1)
 

docs/en/setup/backend/backend-meter.md

@@ -70,9 +70,10 @@ All available meter analysis scripts could be found [here](../../../../oap-serve
 
 | Rule Name | Description | Configuration File | Data Source |
 |-----|-----|-----|-----|
-|spring-sleuth| Metrics of Spring Sleuth Application | meter-analyzer-config/spring-sleuth.yaml | Sprign Sleuth Application --meter format--> SkyWalking OAP Server |
 |satellite| Metrics of SkyWalking Satellite self-observability(so11y)| meter-analyzer-config/satellite.yaml| SkyWalking Satellite --meter format-->SkyWalking OAP Server|
 |threadpool| Metrics of Thread Pool | meter-analyzer-config/threadpool.yaml | Thread Pool --meter format--> SkyWalking OAP Server |
+|datasource| Metrics of DataSource metrics | meter-analyzer-config/datasource.yaml | Datasource --meter format--> SkyWalking OAP Server |
+|spring-sleuth| Metrics of Spring Sleuth Application | meter-analyzer-config/spring-sleuth.yaml | Sprign Sleuth Application --meter format--> SkyWalking OAP Server |
 
 An example can be found [here](../../../../oap-server/server-starter/src/main/resources/meter-analyzer-config/spring-sleuth.yaml).
 If you're using Spring Sleuth, see [Spring Sleuth Setup](spring-sleuth-setup.md).

oap-server/server-starter/src/main/resources/application.yml

@@ -273,7 +273,7 @@ agent-analyzer:
     # Nginx and Envoy agents can't get the real remote address.
     # Exit spans with the component in the list would not generate the client-side instance relation metrics.
     noUpstreamRealAddressAgents: ${SW_NO_UPSTREAM_REAL_ADDRESS:6000,9000}
-    meterAnalyzerActiveFiles: ${SW_METER_ANALYZER_ACTIVE_FILES:threadpool} # Which files could be meter analyzed, files split by ","
+    meterAnalyzerActiveFiles: ${SW_METER_ANALYZER_ACTIVE_FILES:datasource,threadpool} # Which files could be meter analyzed, files split by ","
 
 log-analyzer:
   selector: ${SW_LOG_ANALYZER:default}

oap-server/server-starter/src/main/resources/meter-analyzer-config/datasource.yaml

@@ -0,0 +1,20 @@
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You under the Apache License, Version 2.0
+# (the "License"); you may not use this file except in compliance with
+# the License.  You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+expSuffix: instance(['service'], ['instance'], Layer.GENERAL)
+metricPrefix: meter
+metricsRules:
+  - name: datasource
+    exp:  datasource.sum(['service', 'instance', 'name', 'status'])

oap-server/server-starter/src/main/resources/ui-initialized-templates/apm.yml

@@ -506,6 +506,17 @@ templates:
                   "queryMetricType": "readMetricsValues",
                   "chartType": "ChartLine",
                   "metricName": "instance_clr_available_completion_port_threads,instance_clr_available_worker_threads,instance_clr_max_completion_port_threads,instance_clr_max_worker_threads"
+                },
+                 {
+                   "width": "3",
+                   "title": "Database Connection Pool",
+                   "height": "250",
+                   "entityType": "ServiceInstance",
+                   "independentSelector": false,
+                   "metricType": "LABELED_VALUE",
+                   "metricName": "meter_datasource",
+                   "queryMetricType": "readLabeledMetricsValues",
+                   "chartType": "ChartLine"
                 }
               ]
             },