fix(monitoring): drop unbound LADDER_RANGES in GOA ladder

scripts/taler-monitoring/TESTS.md

@@ -164,29 +164,26 @@ Blockers keep the same ID prefix: `[BLOCKER] e2e-0NN step: message`.
 | ladder-… | Settle coins; **stop on first hard failure** |
 | report | TSV + JSON with **ms_mint / ms_accept / ms_confirm / ms_settle / ms_total** |
 
-Default path:
+Default path (`build_ladder`, strictly increasing):
 
 ```text
 [fixed]  GOA:0
-[low]    random pick in each LADDER_RANGES band (atomic … ~2e6)
+[random] (LADDER_STEPS − 2) log-uniform amounts in (ε, max)
-[high]   LADDER_HIGH_RUNGS random *ranges* log-uniform in [HIGH_FROM, max)
-         (range bounds drawn randomly each run — not fixed 1e7/1e8/…)
 [fixed]  GOA:4503599627370496  (LADDER_MAX_AMOUNT)
 ```
 
+TSV column `range`: `pin:0` | `random` | `pin:max` (no legacy `LADDER_RANGES`).
+
 | Env | Default | Meaning |
 |-----|---------|---------|
-| `LADDER_INCLUDE_ZERO` | `1` | first rung **0** (fixed) |
+| `LADDER_STEPS` | `23` | total rungs (0 + mids + max) |
-| `LADDER_INCLUDE_MAX` | `1` | last rung **max** (fixed) |
+| `LADDER_MAX_AMOUNT` | `4503599627370496` | absolute last pin |
-| `LADDER_MAX_AMOUNT` | `4503599627370496` | absolute pin |
-| `LADDER_HIGH_FROM` | `1000000` | high random zone starts |
-| `LADDER_HIGH_RUNGS` | `12` | # random high ranges |
 | `LADDER_TIMEOUT_S` | `3600` | large rungs need time |
+| `LADDER_MAX_RUNGS` | `99` | cap list length after build |
 
 ```bash
 ./taler-monitoring.sh ladder
-LADDER_HIGH_RUNGS=20 ./taler-monitoring.sh ladder
+LADDER_STEPS=10 ./taler-monitoring.sh ladder
-LADDER_INCLUDE_ZERO=0 LADDER_INCLUDE_MAX=0 ./taler-monitoring.sh ladder
 LADDER_REPORT_DIR=/tmp/my-ladder ./taler-monitoring.sh ladder
 ```
 

scripts/taler-monitoring/check_goa_ladder.sh

@@ -207,8 +207,10 @@ LADDER_LIST=$(build_ladder)
 # shellcheck disable=SC2086
 set -- $LADDER_LIST
 if [ "$#" -gt "$LADDER_MAX_RUNGS" ]; then
+  # shellcheck disable=SC2046
   set -- $(printf '%s\n' "$@" | head -n "$LADDER_MAX_RUNGS")
 fi
+LADDER_N=$#
 info "ladder plan" "$*"
 printf '%s\n' "$@" >"$SCRATCH/ladder-plan.txt"
 
@@ -229,7 +231,14 @@ for AMT in "$@"; do
 
   section "ladder · rung $rung  $AMT"
   tag=$(printf '%s' "$AMT" | tr '.:' '__')
-  range_note=$(printf '%s' "$LADDER_RANGES" | awk -v n="$rung" '{print $n}')
+  # TSV "range" column: fixed pins at ends, random mids (no legacy LADDER_RANGES)
+  if [ "$rung" -eq 1 ]; then
+    range_note="pin:0"
+  elif [ "$rung" -eq "$LADDER_N" ]; then
+    range_note="pin:max"
+  else
+    range_note="random"
+  fi
   t_rung=$(now_ms)
   ms_mint=0 ms_accept=0 ms_confirm=0 ms_settle=0
   note=""

scripts/taler-monitoring/taler-monitoring.sh

@@ -134,10 +134,24 @@ export EXPECT_CURRENCY SKIP_SSH LOCAL_STACK TALER_DOMAIN_PROBE
 export WITHDRAW_AMT PAY_AMT CREDIT_AMT MERCHANT_INSTANCE
 export E2E_FAKE_INCOMING E2E_REMOTE E2E_VARIABLE E2E_ATM_MAX
 export E2E_WITHDRAW_VALUES E2E_PAY_VALUES
-export LADDER_RANGES LADDER_MAX_RUNGS LADDER_TIMEOUT_S LADDER_REPORT_DIR
+# Ladder: 0 + random mids + max (see check_goa_ladder.sh build_ladder). No LADDER_RANGES.
+# Defaults so set -u export is safe when vars were never set by caller.
+: "${LADDER_STEPS:=23}"
+: "${LADDER_MAX_RUNGS:=99}"
+: "${LADDER_TIMEOUT_S:=3600}"
+: "${LADDER_REPORT_DIR:=}"
+: "${LADDER_SETTLE_ROUNDS:=18}"
+: "${LADDER_SETTLE_SLEEP:=2}"
+: "${LADDER_MAX_AMOUNT:=4503599627370496}"
+: "${LADDER_INCLUDE_ZERO:=1}"
+: "${LADDER_INCLUDE_MAX:=1}"
+: "${LADDER_HIGH_FROM:=1000000}"
+: "${LADDER_HIGH_RUNGS:=12}"
+: "${LADDER_LOAD:=1}"
+export LADDER_STEPS LADDER_MAX_RUNGS LADDER_TIMEOUT_S LADDER_REPORT_DIR
 export LADDER_SETTLE_ROUNDS LADDER_SETTLE_SLEEP EXP_PW_FILE EXP_USER
 export LADDER_MAX_AMOUNT LADDER_INCLUDE_ZERO LADDER_INCLUDE_MAX
-export LADDER_HIGH_FROM LADDER_HIGH_RUNGS
+export LADDER_HIGH_FROM LADDER_HIGH_RUNGS LADDER_LOAD
 export TALER_DOMAIN_APPLIED=1
 
 # Default phases