merge job rusage and pending reason support

src/worker/include/xcecd_cgroups.h

@@ -1,6 +1,7 @@
 #ifndef _XCECD_CGROUPS_H_
 #define _XCECD_CGROUPS_H_
 
+#include "xcecd_utils.h"
 #include <stdbool.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -93,4 +94,13 @@ int get_systemd_job_exit_code(const char* unit_name);
  */
 char* get_systemd_job_status_text(const char* unit_name);
 
+/**
+ * @brief Collect resource usage statistics for a systemd job.
+ * @param job_id The ID of the job.
+ * @return A pointer to an xce_job_rusages_t struct, or NULL on failure.
+ *         The caller is responsible for freeing the returned struct
+ *         using free_xce_job_rusages().
+ */
+xce_job_rusages_t* collect_job_rusages(uint64_t job_id);
+
 #endif // _XCECD_CGROUPS_H_