diff --git a/src/service/core.py b/src/service/core.py
index 3d7a5c1..996a4ce 100644
--- a/src/service/core.py
+++ b/src/service/core.py
@@ -56,6 +56,10 @@ def get_counter(name: str, documentation: str, labelnames: list[str]) -> Counter
                                          "Total bytes processed by the engine", [
                                              "component_type", "component_id"])
 
+data_processed_lines_total = get_counter("data_processed_lines_total",
+                                         "Total lines processed by the engine", [
+                                             "component_type", "component_id"])
+
 
 class Service(Engine, ABC):
     """Abstract base for every DetectMate service/component.
@@ -183,6 +187,12 @@ def process(self, raw_message: bytes) -> bytes | None | Any:
                 component_id=self.component_id
             ).inc(len(raw_message))
 
+            lines = raw_message.count(b'\n') or 1  # at least 1 if message exists
+            data_processed_lines_total.labels(
+                component_type=self.component_type,
+                component_id=self.component_id
+            ).inc(lines)
+
         # Track processing time
         with processing_duration_seconds.labels(
             component_type=self.component_type,