workbench: add idle & tracer-only scenario/profile/targets

Author: deepfire

Makefile

@@ -68,7 +68,7 @@ ps:                                              ## Plain-text list of profiles
 ##
 ## Profile-based cluster shells (autogenerated targets)
 ##
-PROFILES_BASE         := default plutus oldtracing
+PROFILES_BASE         := default plutus oldtracing idle tracer-only
 PROFILES_STARTSTOP    := startstop startstop-p2p startstop-plutus startstop-notracer startstop-oldtracing
 PROFILES_CI_TEST      := ci-test ci-test-p2p ci-test-plutus ci-test-notracer ci-test-dense10
 PROFILES_CI_BENCH     := ci-bench ci-bench-p2p ci-bench-plutus ci-bench-notracer

nix/workbench/profiles/prof1-variants.jq

@@ -290,6 +290,12 @@ def all_profile_variants:
    ($compressed_timescale * $current_tps_saturation_value *
     { scenario:                        "fixed-loaded"
     }) as $scenario_fixed_loaded
+  |
+   ({ scenario:                        "idle"
+    }) as $scenario_idle
+  |
+   ({ scenario:                        "tracer-only"
+    }) as $scenario_tracer_only
   |
   ##
   ### Definition vocabulary:  base variant
@@ -369,6 +375,14 @@ def all_profile_variants:
     { name: "oldtracing"
     , desc: "Default in legacy tracing mode"
     }
+  , $scenario_idle *
+    { name: "idle"
+    , desc: "Idle scenario:  start nodes & detach from tty;  no cluster termination"
+    }
+  , $scenario_tracer_only *
+    { name: "tracer-only"
+    , desc: "Idle scenario:  start only the tracer & detach from tty;  no termination"
+    }
 
   ## Fastest -- start-stop
   , $startstop_base *

nix/workbench/scenario.sh

@@ -34,6 +34,10 @@ case "$op" in
         backend start-nodes          "$dir"
         ;;
 
+    tracer-only )
+        backend start                "$dir"
+        ;;
+
     fixed )
         backend start                "$dir"