Posthog to log to log file (#2813)

# Description of Changes

Please provide a summary of the changes, including:

- What was changed
- Why the change was made
- Any challenges encountered

Closes #(issue_number)

---

## Checklist

### General

- [ ] I have read the [Contribution
Guidelines](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/CONTRIBUTING.md)
- [ ] I have read the [Stirling-PDF Developer
Guide](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/DeveloperGuide.md)
(if applicable)
- [ ] I have read the [How to add new languages to
Stirling-PDF](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/HowToAddNewLanguage.md)
(if applicable)
- [ ] I have performed a self-review of my own code
- [ ] My changes generate no new warnings

### Documentation

- [ ] I have updated relevant docs on [Stirling-PDF's doc
repo](https://github.com/Stirling-Tools/Stirling-Tools.github.io/blob/main/docs/)
(if functionality has heavily changed)
- [ ] I have read the section [Add New Translation
Tags](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/HowToAddNewLanguage.md#add-new-translation-tags)
(for new translation tags only)

### UI Changes (if applicable)

- [ ] Screenshots or videos demonstrating the UI changes are attached
(e.g., as comments or direct attachments in the PR)

### Testing (if applicable)

- [ ] I have tested my changes locally. Refer to the [Testing
Guide](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/DeveloperGuide.md#6-testing)
for more details.

---------

Co-authored-by: a <a>

src/main/java/stirling/software/SPDF/config/PostHogConfig.java

@@ -7,8 +7,10 @@ import org.springframework.context.annotation.Configuration;
 import com.posthog.java.PostHog;
 
 import jakarta.annotation.PreDestroy;
+import lombok.extern.slf4j.Slf4j;
 
 @Configuration
+@Slf4j
 public class PostHogConfig {
 
     @Value("${posthog.api.key}")
@@ -21,7 +23,11 @@ public class PostHogConfig {
 
     @Bean
     public PostHog postHogClient() {
-        postHogClient = new PostHog.Builder(posthogApiKey).host(posthogHost).build();
+        postHogClient =
+                new PostHog.Builder(posthogApiKey)
+                        .host(posthogHost)
+                        .logger(new PostHogLoggerImpl())
+                        .build();
         return postHogClient;
     }
 

src/main/java/stirling/software/SPDF/config/PostHogLoggerImpl.java

@@ -0,0 +1,42 @@
+package stirling.software.SPDF.config;
+
+import org.springframework.stereotype.Component;
+
+import com.posthog.java.PostHogLogger;
+
+import lombok.extern.slf4j.Slf4j;
+
+@Slf4j
+@Component
+public class PostHogLoggerImpl implements PostHogLogger {
+
+    @Override
+    public void debug(String message) {
+        log.debug(message);
+    }
+
+    @Override
+    public void info(String message) {
+        log.info(message);
+    }
+
+    @Override
+    public void warn(String message) {
+        log.warn(message);
+    }
+
+    @Override
+    public void error(String message) {
+        log.error(message);
+    }
+
+    @Override
+    public void error(String message, Throwable throwable) {
+        if (message.contains("Error sending events to PostHog")) {
+            log.warn(
+                    "Error sending metrics, Likely caused by no internet connection. Non Blocking");
+        } else {
+            log.error(message, throwable);
+        }
+    }
+}