add unit to x axis label in histo plots

slurm-eff-tool.py

@@ -1671,6 +1671,16 @@ def histo_graphs(out_rows: list[OutputRow], args: argparse.Namespace):
     term = args.hterm
     plotstyle = "set style fill transparent solid 0.35 noborder"
     linestyle = "with steps lw 2"
+    xax_unitstr = {
+        "elig_qtime": " (h)",
+        "mem_eff": "",
+        "planned_time": " (h)",
+        "usedmem": " (GB)",
+        "vpu_eff": "",
+        "start": "",
+        "time_eff": "",
+        "walltime": " (h)"
+    }
 
     if term in ("svg", "png"):
         width, height = 900, 600
@@ -1745,7 +1755,7 @@ def histo_graphs(out_rows: list[OutputRow], args: argparse.Namespace):
 
         gnuplot_cmd = (f'set title "{metric} distribution" noenhanced\n'
                        f'{xax_format}'
-                       f'set xlabel "{metric}" noenhanced\n'
+                       f'set xlabel "{metric}{xax_unitstr[metric]}" noenhanced\n'
                        f'set ylabel "jobs"\n'
                        f'{plotstyle}\n'
                        f'{termsetup[term]}\n'