diff --git a/libs/reactive-core/src/main/java/no/nav/testnav/libs/reactivecore/logging/TestnavLogbackEncoder.java b/libs/reactive-core/src/main/java/no/nav/testnav/libs/reactivecore/logging/TestnavLogbackEncoder.java
index 544251c47d6..67acbbe5fee 100644
--- a/libs/reactive-core/src/main/java/no/nav/testnav/libs/reactivecore/logging/TestnavLogbackEncoder.java
+++ b/libs/reactive-core/src/main/java/no/nav/testnav/libs/reactivecore/logging/TestnavLogbackEncoder.java
@@ -3,58 +3,113 @@
 import ch.qos.logback.classic.spi.ILoggingEvent;
 import ch.qos.logback.classic.spi.ThrowableProxy;
 import com.fasterxml.jackson.core.JsonFactory;
+import lombok.Setter;
 import lombok.SneakyThrows;
 import lombok.extern.slf4j.Slf4j;
 import net.logstash.logback.encoder.LogstashEncoder;
+import org.springframework.util.StringUtils;
 
 import java.io.ByteArrayOutputStream;
-import java.io.PrintWriter;
 import java.io.StringWriter;
 import java.util.regex.Pattern;
 
+import static java.util.Objects.isNull;
 import static java.util.Objects.nonNull;
-
+import static org.springframework.util.StringUtils.truncate;
+
+/**
+ * Config:
+ * <ul>
+ * <li>{@code maxStackTraceLength}: Default 480, set to <1 to disable truncation of stack trace altogether.</li>
+ * <li>{@code addCauses}: If enabled, adds the cause(s) to the stack trace (with stack traces for each cause) Truncated according to above, filtered according to below.</li>
+ * <li>{@code stackTraceIncludePrefix}: If set, only include stack trace elements that starts with the given prefix, e.g. "no.nav.testnav".</li>
+ * </ul>
+ * Copy of {@code no.nav.testnav.libs.servletcore.logging.TestnavLogbackEncoder}.
+ *
+ * @see StringUtils#truncate(CharSequence, int)
+ */
 @Slf4j
+@SuppressWarnings("java:S110")
 public class TestnavLogbackEncoder extends LogstashEncoder {
 
     // matches exactly 11 digits (\\d{11}) that are not immediately preceded ((?<!\\d)) or followed ((?!\\d)) by another digit.
     private final Pattern pattern = Pattern.compile("(?<!\\d)\\d{11}(?!\\d)");
 
+    @Setter
+    private int maxStackTraceLength = 480;
+
+    @Setter
+    private boolean addCauses = false;
+
+    @Setter
+    private String stackTraceIncludePrefix = null;
+
     @SneakyThrows
     @Override
     public byte[] encode(ILoggingEvent event) {
-        var outputStream = new ByteArrayOutputStream();
 
-        var generator = new JsonFactory().createGenerator(outputStream);
-
-        generator.writeStartObject();
+        var outputStream = new ByteArrayOutputStream();
+        try (var generator = new JsonFactory().createGenerator(outputStream)) {
+
+            generator.writeStartObject();
+            generator.writeStringField("@timestamp", new java.text.SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSSSSSSSSXXX")
+                    .format(new java.util.Date(event.getTimeStamp())));
+            generator.writeStringField("message", formatMessage(event.getFormattedMessage()));
+            generator.writeStringField("logger_name", event.getLoggerName());
+            generator.writeStringField("thread_name", event.getThreadName());
+            generator.writeStringField("level", event.getLevel().toString());
+            generator.writeStringField("stack_trace", getStackTrace(event));
+            generator.writeEndObject();
+
+            generator.flush();
+            outputStream.write('\n');
+        }
 
-        generator.writeStringField("@timestamp", new java.text.SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSSSSSSSSXXX")
-                .format(new java.util.Date(event.getTimeStamp())));
-        generator.writeStringField("message", formatMessage(event.getFormattedMessage()));
-        generator.writeStringField("logger_name", event.getLoggerName());
-        generator.writeStringField("thread_name", event.getThreadName());
-        generator.writeStringField("level", event.getLevel().toString());
+        return outputStream.toByteArray();
+    }
 
+    private String getStackTrace(ILoggingEvent event) {
         if (nonNull(event.getThrowableProxy())) {
             var exception = (ThrowableProxy) event.getThrowableProxy();
             if (nonNull(exception.getThrowable())) {
-                var sw = new StringWriter();
-                var pw = new PrintWriter(sw);
-                for (StackTraceElement element : exception.getThrowable().getStackTrace()) {
-                    pw.println("\tat " + element);
-                }
-                var stackTrace = sw.toString().substring(0, 480); //Limit the stack trace to 480 characters
-                generator.writeStringField("stack_trace", stackTrace);
+                var writer = new StringWriter();
+                appendStackTraceElements(exception.getThrowable().getStackTrace(), writer);
+                appendStackTraceCauses(exception, writer);
+                return maxStackTraceLength > 0 ?
+                        truncate(writer.toString(), maxStackTraceLength) :
+                        writer.toString();
             }
         }
+        return null;
+    }
 
-        generator.writeEndObject();
-
-        generator.flush();
-        outputStream.write('\n');
+    private void appendStackTraceElements(StackTraceElement[] elements, StringWriter writer) {
+        for (StackTraceElement element : elements) {
+            if (isNull(stackTraceIncludePrefix) || stackTraceIncludePrefix.isEmpty() || element.toString().startsWith(stackTraceIncludePrefix)) {
+                writer
+                        .append("\tat ")
+                        .append(element.toString())
+                        .append("\n");
+            }
+        }
+    }
 
-        return outputStream.toByteArray();
+    private void appendStackTraceCauses(ThrowableProxy exception, StringWriter writer) {
+        if (addCauses) {
+            var cause = exception;
+            while (!isNull(cause.getCause())) {
+                cause = (ThrowableProxy) cause.getCause();
+                writer
+                        .append("caused by ")
+                        .append(cause.getClassName())
+                        .append(": ")
+                        .append(cause.getMessage())
+                        .append("\n");
+                if (!isNull(cause.getThrowable())) {
+                    appendStackTraceElements(cause.getThrowable().getStackTrace(), writer);
+                }
+            }
+        }
     }
 
     private String formatMessage(String message) {
diff --git a/libs/servlet-core/src/main/java/no/nav/testnav/libs/servletcore/logging/TestnavLogbackEncoder.java b/libs/servlet-core/src/main/java/no/nav/testnav/libs/servletcore/logging/TestnavLogbackEncoder.java
index 440949ff602..2158548eb68 100644
--- a/libs/servlet-core/src/main/java/no/nav/testnav/libs/servletcore/logging/TestnavLogbackEncoder.java
+++ b/libs/servlet-core/src/main/java/no/nav/testnav/libs/servletcore/logging/TestnavLogbackEncoder.java
@@ -3,58 +3,113 @@
 import ch.qos.logback.classic.spi.ILoggingEvent;
 import ch.qos.logback.classic.spi.ThrowableProxy;
 import com.fasterxml.jackson.core.JsonFactory;
+import lombok.Setter;
 import lombok.SneakyThrows;
 import lombok.extern.slf4j.Slf4j;
 import net.logstash.logback.encoder.LogstashEncoder;
+import org.springframework.util.StringUtils;
 
 import java.io.ByteArrayOutputStream;
-import java.io.PrintWriter;
 import java.io.StringWriter;
 import java.util.regex.Pattern;
 
+import static java.util.Objects.isNull;
 import static java.util.Objects.nonNull;
-
+import static org.springframework.util.StringUtils.truncate;
+
+/**
+ * Config:
+ * <ul>
+ * <li>{@code maxStackTraceLength}: Default 480, set to <1 to disable truncation of stack trace altogether.</li>
+ * <li>{@code addCauses}: If enabled, adds the cause(s) to the stack trace (with stack traces for each cause) Truncated according to above, filtered according to below.</li>
+ * <li>{@code stackTraceIncludePrefix}: If set, only include stack trace elements that starts with the given prefix, e.g. "no.nav.testnav".</li>
+ * </ul>
+ * Copy of {@code no.nav.testnav.libs.servletcore.logging.TestnavLogbackEncoder}.
+ *
+ * @see StringUtils#truncate(CharSequence, int)
+ */
 @Slf4j
+@SuppressWarnings("java:S110")
 public class TestnavLogbackEncoder extends LogstashEncoder {
 
     // matches exactly 11 digits (\\d{11}) that are not immediately preceded ((?<!\\d)) or followed ((?!\\d)) by another digit.
     private final Pattern pattern = Pattern.compile("(?<!\\d)\\d{11}(?!\\d)");
 
+    @Setter
+    private int maxStackTraceLength = 480;
+
+    @Setter
+    private boolean addCauses = false;
+
+    @Setter
+    private String stackTraceIncludePrefix = null;
+
     @SneakyThrows
     @Override
     public byte[] encode(ILoggingEvent event) {
-        var outputStream = new ByteArrayOutputStream();
 
-        var generator = new JsonFactory().createGenerator(outputStream);
-
-        generator.writeStartObject();
+        var outputStream = new ByteArrayOutputStream();
+        try (var generator = new JsonFactory().createGenerator(outputStream)) {
+
+            generator.writeStartObject();
+            generator.writeStringField("@timestamp", new java.text.SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSSSSSSSSXXX")
+                    .format(new java.util.Date(event.getTimeStamp())));
+            generator.writeStringField("message", formatMessage(event.getFormattedMessage()));
+            generator.writeStringField("logger_name", event.getLoggerName());
+            generator.writeStringField("thread_name", event.getThreadName());
+            generator.writeStringField("level", event.getLevel().toString());
+            generator.writeStringField("stack_trace", getStackTrace(event));
+            generator.writeEndObject();
+
+            generator.flush();
+            outputStream.write('\n');
+        }
 
-        generator.writeStringField("@timestamp", new java.text.SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSSSSSSSSXXX")
-                .format(new java.util.Date(event.getTimeStamp())));
-        generator.writeStringField("message", formatMessage(event.getFormattedMessage()));
-        generator.writeStringField("logger_name", event.getLoggerName());
-        generator.writeStringField("thread_name", event.getThreadName());
-        generator.writeStringField("level", event.getLevel().toString());
+        return outputStream.toByteArray();
+    }
 
+    private String getStackTrace(ILoggingEvent event) {
         if (nonNull(event.getThrowableProxy())) {
             var exception = (ThrowableProxy) event.getThrowableProxy();
             if (nonNull(exception.getThrowable())) {
-                var sw = new StringWriter();
-                var pw = new PrintWriter(sw);
-                for (StackTraceElement element : exception.getThrowable().getStackTrace()) {
-                    pw.println("\tat " + element);
-                }
-                var stackTrace = sw.toString().substring(0, 480); //Limit the stack trace to 480 characters
-                generator.writeStringField("stack_trace", stackTrace);
+                var writer = new StringWriter();
+                appendStackTraceElements(exception.getThrowable().getStackTrace(), writer);
+                appendStackTraceCauses(exception, writer);
+                return maxStackTraceLength > 0 ?
+                        truncate(writer.toString(), maxStackTraceLength) :
+                        writer.toString();
             }
         }
+        return null;
+    }
 
-        generator.writeEndObject();
-
-        generator.flush();
-        outputStream.write('\n');
+    private void appendStackTraceElements(StackTraceElement[] elements, StringWriter writer) {
+        for (StackTraceElement element : elements) {
+            if (isNull(stackTraceIncludePrefix) || stackTraceIncludePrefix.isEmpty() || element.toString().startsWith(stackTraceIncludePrefix)) {
+                writer
+                        .append("\tat ")
+                        .append(element.toString())
+                        .append("\n");
+            }
+        }
+    }
 
-        return outputStream.toByteArray();
+    private void appendStackTraceCauses(ThrowableProxy exception, StringWriter writer) {
+        if (addCauses) {
+            var cause = exception;
+            while (!isNull(cause.getCause())) {
+                cause = (ThrowableProxy) cause.getCause();
+                writer
+                        .append("caused by ")
+                        .append(cause.getClassName())
+                        .append(": ")
+                        .append(cause.getMessage())
+                        .append("\n");
+                if (!isNull(cause.getThrowable())) {
+                    appendStackTraceElements(cause.getThrowable().getStackTrace(), writer);
+                }
+            }
+        }
     }
 
     private String formatMessage(String message) {