diff --git a/runtime/src/main/java/eu/mulk/quarkus/googlecloud/jsonlogging/Formatter.java b/runtime/src/main/java/eu/mulk/quarkus/googlecloud/jsonlogging/Formatter.java
index d2e5562..c6e177c 100644
--- a/runtime/src/main/java/eu/mulk/quarkus/googlecloud/jsonlogging/Formatter.java
+++ b/runtime/src/main/java/eu/mulk/quarkus/googlecloud/jsonlogging/Formatter.java
@@ -3,6 +3,7 @@
 import java.io.PrintWriter;
 import java.io.StringWriter;
 import java.util.ArrayList;
+import java.util.Collection;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
@@ -28,12 +29,26 @@
   private static final String ERROR_EVENT_TYPE =
       "type.googleapis.com/google.devtools.clouderrorreporting.v1beta1.ReportedErrorEvent";
 
+  private final List<ParameterProvider> parameterProviders;
+
+  public Formatter(Collection<ParameterProvider> parameterProviders) {
+    this.parameterProviders = List.copyOf(parameterProviders);
+  }
+
   @Override
   public String format(ExtLogRecord logRecord) {
     var message = formatMessageWithStackTrace(logRecord);
 
     List<StructuredParameter> parameters = new ArrayList<>();
     Map<String, String> labels = new HashMap<>();
+
+    for (var parameterProvider : parameterProviders) {
+      var parameter = parameterProvider.get();
+      if (parameter != null) {
+        parameters.add(parameter);
+      }
+    }
+
     if (logRecord.getParameters() != null) {
       for (var parameter : logRecord.getParameters()) {
         if (parameter instanceof StructuredParameter) {
diff --git a/runtime/src/main/java/eu/mulk/quarkus/googlecloud/jsonlogging/GoogleCloudJsonLoggingRecorder.java b/runtime/src/main/java/eu/mulk/quarkus/googlecloud/jsonlogging/GoogleCloudJsonLoggingRecorder.java
index db2c2e9..ace4a28 100644
--- a/runtime/src/main/java/eu/mulk/quarkus/googlecloud/jsonlogging/GoogleCloudJsonLoggingRecorder.java
+++ b/runtime/src/main/java/eu/mulk/quarkus/googlecloud/jsonlogging/GoogleCloudJsonLoggingRecorder.java
@@ -1,12 +1,16 @@
 package eu.mulk.quarkus.googlecloud.jsonlogging;
 
+import io.quarkus.arc.Arc;
 import io.quarkus.runtime.RuntimeValue;
 import io.quarkus.runtime.annotations.Recorder;
 import java.util.Optional;
+import java.util.stream.Collectors;
 
 @Recorder
 public class GoogleCloudJsonLoggingRecorder {
   public RuntimeValue<Optional<java.util.logging.Formatter>> initialize() {
-    return new RuntimeValue<>(Optional.of(new Formatter()));
+    var parameterProviders =
+        Arc.container().select(ParameterProvider.class).stream().collect(Collectors.toList());
+    return new RuntimeValue<>(Optional.of(new Formatter(parameterProviders)));
   }
 }
diff --git a/runtime/src/main/java/eu/mulk/quarkus/googlecloud/jsonlogging/ParameterProvider.java b/runtime/src/main/java/eu/mulk/quarkus/googlecloud/jsonlogging/ParameterProvider.java
new file mode 100644
index 0000000..fb212a3
--- /dev/null
+++ b/runtime/src/main/java/eu/mulk/quarkus/googlecloud/jsonlogging/ParameterProvider.java
@@ -0,0 +1,12 @@
+package eu.mulk.quarkus.googlecloud.jsonlogging;
+
+/**
+ * A user-supplied provider for {@link StructuredParameter}s.
+ *
+ * <p>Any CDI beans registered under this class are applied to each log entry that is logged.
+ */
+public interface ParameterProvider {
+
+  /** Provides a {@link StructuredParameter} to add to each log entry that is logged. */
+  StructuredParameter get();
+}