better y-axis range

generate_graphs.py

@@ -22,10 +22,22 @@ def graph(output: Path, rrd: Path, start: str, title: str, unit: str,
           trouble_mixed: bool = False) -> None:
     args = ["rrdtool", "graph", str(output), "--start", f"end-{start}",
             "--end", "now", "--width", "900", "--height", "260",
-            "--title", title, "--vertical-label", unit, "--slope-mode",
+            "--title", title, "--vertical-label", unit,
             "--watermark", "cheap-system-monitor"]
+    if not trouble_mixed:
+        args.append("--slope-mode")
     if logarithmic:
         args += ["--logarithmic", "--lower-limit", "1"]
+    if title.startswith("Processor load"):
+        # RRD's `m` axis suffix means milli-load: 1000m is a load of 1.0.
+        args += ["--lower-limit", "0", "--upper-limit", "1", "--rigid",
+                 "--units-exponent", "-3"]
+    if title.startswith("CPU usage"):
+        args += ["--lower-limit", "0", "--upper-limit", "80", "--rigid"]
+    if trouble_mixed:
+        args += ["--lower-limit", "0", "--upper-limit", "20", "--rigid"]
+    if disk_memory:
+        args += ["--lower-limit", "0", "--upper-limit", "100", "--rigid"]
     if thermal_mixed:
         args += ["--lower-limit", "0", "--upper-limit", "100", "--rigid"]
     if any(ds.startswith("health_") for ds, _label, _cf in series):
@@ -51,7 +63,9 @@ def graph(output: Path, rrd: Path, start: str, title: str, unit: str,
                      f"GPRINT:{var}:AVERAGE:Average\\:%8.2lf",
                      f"GPRINT:{var}:MAX:Maximum\\:%8.2lf\\n"]
             continue
-        if network_mixed and ds == "net_out":
+        if trouble_mixed and ds == "failed_services":
+            drawing = f"AREA:{var}#2563EB80:{label}"
+        elif network_mixed and ds == "net_out":
             drawing = f"AREA:{var}#86EFAC:{label}"
         elif network_mixed and ds == "net_in":
             drawing = f"LINE3:{var}#2563EB:{label}"