diff --git a/internal/tagger/apps/julia.txt b/internal/tagger/apps/julia.txt
new file mode 100644
index 0000000..9146f2b
--- /dev/null
+++ b/internal/tagger/apps/julia.txt
@@ -0,0 +1 @@
+julia
diff --git a/internal/tagger/jobclasses/lowUtilization.json b/internal/tagger/jobclasses/lowUtilization.json
new file mode 100644
index 0000000..9613b06
--- /dev/null
+++ b/internal/tagger/jobclasses/lowUtilization.json
@@ -0,0 +1,22 @@
+{
+  "name": "Low ressource utilization",
+  "tag": "lowutilization",
+  "parameters": ["job_min_duration_seconds"],
+  "metrics": ["flops_any", "mem_bw"],
+  "requirements": [
+    "job.exclusive == 1",
+    "job.duration > job_min_duration_seconds"
+  ],
+  "variables": [
+    {
+      "name": "mem_bw_perc",
+      "expr": "1.0 - (mem_bw.avg / mem_bw.limits.peak)"
+    },
+    {
+      "name": "flops_any_perc",
+      "expr": "1.0 - (flops_any.avg / flops_any.limits.peak)"
+    }
+  ],
+  "rule": "flops_any.avg < flops_any.limits.alert && mem_bw.avg < mem_bw.limits.alert",
+  "hint": "This job was detected as low utilization because the average flop rate {{.flops_any.avg}} falls below the threshold {{.flops_any.limits.alert}}."
+}
diff --git a/internal/tagger/rules.json b/internal/tagger/rules.json
deleted file mode 100644
index c88afb4..0000000
--- a/internal/tagger/rules.json
+++ /dev/null
@@ -1,21 +0,0 @@
-{
-    "and": [
-      {
-        "in": [
-          "a40",
-          {
-            "var": "metaData.jobScript"
-          }
-        ]
-      },
-      {
-        ">": [
-          {
-            "var": "statistics.clock.min"
-          },
-          2000
-        ]
-      }
-    ]
-  }
-  
\ No newline at end of file