First fix proposed from JessicaFM@ddb8f70

Author: jmfernandez

execution_process_metrics_collector/collector.py

@@ -594,9 +594,9 @@ def process_metrics_collector(
                     str(len(child_d["threads_processor_num"])),
                     str(len(child_d["threads_core_num"])),
                     str(len(child_d["threads_cpu_num"])),
-                    " ".join(child_d["threads_processor_num"]),
-                    " ".join(child_d["threads_core_num"]),
-                    " ".join(child_d["threads_cpu_num"]),
+                    " ".join(map(str, child_d["threads_processor_num"])),
+                    " ".join(map(str, child_d["threads_core_num"])),
+                    " ".join(map(str, child_d["threads_cpu_num"])),
                     str(child_d["status"]),
                     str(c_io.read_count),
                     str(c_io.write_count),