add grafana loki config

pom.xml

@@ -169,6 +169,12 @@
             <artifactId>spring-boot-starter-mail</artifactId>
             <version>3.1.5</version>
         </dependency>
+        <!-- Maven -->
+        <dependency>
+            <groupId>com.github.loki4j</groupId>
+            <artifactId>loki-logback-appender</artifactId>
+            <version>2.0.1</version> <!-- Use the latest version -->
+        </dependency>
     </dependencies>
 
 	<build>

src/main/java/zw/qantra/tm/domain/controllers/TestController.java

@@ -1,6 +1,8 @@
 package zw.qantra.tm.domain.controllers;
 
 import lombok.RequiredArgsConstructor;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.http.ResponseEntity;
 import org.springframework.security.core.Authentication;
@@ -19,6 +21,19 @@ public class TestController {
     private final EmailService emailService;
     private final TransactionService transactionService;
 
+    private static final Logger logger = LoggerFactory.getLogger(TestController.class);
+
+    @GetMapping("/test-logs")
+    public String testLogs() {
+        logger.trace("This is a TRACE log");
+        logger.debug("This is a DEBUG log");
+        logger.info("This is an INFO log");
+        logger.warn("This is a WARN log");
+        logger.error("This is an ERROR log");
+
+        return "Logs sent to OpenTelemetry!";
+    }
+
     @PostMapping("/dbtest")
     public ResponseEntity<Object> dbtest(@RequestBody Transaction transaction) {
         transactionService.save(transaction);

src/main/resources/application.properties

@@ -1,4 +1,4 @@
-spring.application.name=tm
+spring.application.name=qpay-tm
 debug=false
 
 logging.level.org.springframework.boot.autoconfigure=INFO
@@ -70,3 +70,8 @@ powertel.clientid=zesa_prepaid_usd
 
 ecocash.apikey=OUzGezwTgktLg_9v0I48I6WUM4LVLGFl
 ecocash.url=https://developers.ecocash.co.zw/api/ecocash_pay/api/v2/payment/instant/c2b/sandbox
+
+management.tracing.enabled=true
+management.tracing.sampling.probability=1.0
+management.otlp.tracing.endpoint=http://62.171.179.108:10428/insert/opentelemetry/v1/traces
+management.otlp.logging.endpoint=http://62.171.179.108:9428/insert/opentelemetry/v1/logs

src/main/resources/logback-spring.xml

@@ -26,14 +26,31 @@
         </encoder>
     </appender>
 
+    <appender name="LOKI" class="com.github.loki4j.logback.Loki4jAppender">
+        <labels>
+            app=qpay-tm
+            host=${HOSTNAME}
+        </labels>
+        <http>
+            <url>http://62.171.179.108:3100/loki/api/v1/push</url> <!-- Replace with your Loki URL -->
+        </http>
+        <format>
+            <message>
+                <pattern>%d{yyyy-MM-dd HH:mm:ss.SSS} %-5level [%thread] %logger{36} - %msg%n</pattern>
+            </message>
+        </format>
+    </appender>
+
     <!-- Root logger configuration -->
     <root level="INFO">
+        <appender-ref ref="LOKI"/>
         <appender-ref ref="CONSOLE" />
         <appender-ref ref="FILE" />
     </root>
 
     <!-- Specific logger for your application -->
     <logger name="zw.qantra.tm" level="INFO" additivity="false">
+        <appender-ref ref="LOKI"/>
         <appender-ref ref="CONSOLE" />
         <appender-ref ref="FILE" />
     </logger>