update to zfs snapshot to ignore specified pools

Monitors/zfs_memory_snapshot.sh

@@ -10,6 +10,9 @@
 # Output goes to both console and ZFS_REPORT_LOG for later review.
 # Notifies if any warning thresholds are exceeded.
 #
+# Pools listed in ZFS_REPORT_IGNORE_POOLS are excluded from health reporting.
+# Useful for pools expected to run at high usage (docker, cache etc.)
+#
 # All configuration in Master.conf under ZFS Memory Snapshot section.
 # Supports --dry-run (preview only, no log write) and --status.
 # -----------------------------------------------------------------------------------------------
@@ -40,6 +43,16 @@ fi
 
 success "Running as root"
 
+# Build ignore list for quick lookup
+declare -A IGNORE_POOL_MAP
+for pool in "${ZFS_REPORT_IGNORE_POOLS[@]}"; do
+    [[ -n "$pool" ]] && IGNORE_POOL_MAP["$pool"]=1
+done
+
+if [[ ${#ZFS_REPORT_IGNORE_POOLS[@]} -gt 0 ]]; then
+    info "Ignoring pools: ${ZFS_REPORT_IGNORE_POOLS[*]}"
+fi
+
 # -----------------------------------------------------------------------------------------------
 # ━━━ $ICON_SUMMARY Status ━━━
 # -----------------------------------------------------------------------------------------------
@@ -51,6 +64,7 @@ if [[ "$SHOW_STATUS" == true ]]; then
     echo "$ICON_MEM  Free RAM warn:    ${ZFS_REPORT_FREE_WARN_GB}GB"
     echo "$ICON_MEM  Avail RAM warn:   ${ZFS_REPORT_AVAIL_WARN_GB}GB"
     echo "$ICON_CONTAINERS Docker top: $ZFS_REPORT_DOCKER_TOP"
+    echo "$ICON_ZFS  Ignore pools:     ${ZFS_REPORT_IGNORE_POOLS[*]:-none}"
     echo "$ICON_GEAR Dry Run:          $DRY_RUN"
     echo "━━━━━━━━━━━━━━━━━━━━━━━"
     exit 0
@@ -80,24 +94,50 @@ echo "━━━ $ICON_ZFS ZFS Pool Health ━━━"
 if ! command -v zpool >/dev/null 2>&1; then
     warn "ZFS not available on this system — skipping pool checks"
 else
+    # Pool status — filtered to key lines, ignoring specified pools
     info "Pool status:"
-    zpool status 2>/dev/null | grep -E "pool:|state:|status:|errors:|scan:" | while IFS= read -r line; do
+    while IFS= read -r line; do
+        # Extract pool name from "pool: poolname" lines
+        if [[ "$line" =~ ^[[:space:]]*pool:[[:space:]]*(.+) ]]; then
+            CURRENT_POOL="${BASH_REMATCH[1]// /}"
+        fi
+        # Skip lines belonging to ignored pools
+        [[ -n "${IGNORE_POOL_MAP[$CURRENT_POOL]:-}" ]] && continue
         echo "  $line"
-    done
+    done < <(zpool status 2>/dev/null | grep -E "pool:|state:|status:|errors:|scan:")
 
     echo ""
 
+    # Pool list — filter out ignored pools
     info "Pool overview:"
     zpool list 2>/dev/null | while IFS= read -r line; do
+        # Always show header line
+        if [[ "$line" == NAME* ]]; then
+            echo "  $line"
+            continue
+        fi
+        # Extract pool name (first field)
+        pool_name=$(echo "$line" | awk '{print $1}')
+        [[ -n "${IGNORE_POOL_MAP[$pool_name]:-}" ]] && continue
         echo "  $line"
     done
 
-    UNHEALTHY=$(zpool list -H -o health 2>/dev/null | grep -v ONLINE || true)
+    # Check for unhealthy pools — excluding ignored ones
+    UNHEALTHY=$(zpool list -H -o name,health 2>/dev/null | while IFS=$'\t' read -r name health; do
+        [[ -n "${IGNORE_POOL_MAP[$name]:-}" ]] && continue
+        [[ "$health" != "ONLINE" ]] && echo "$name: $health"
+    done)
+
     if [[ -n "$UNHEALTHY" ]]; then
-        error "One or more ZFS pools are NOT ONLINE"
+        error "One or more ZFS pools are NOT ONLINE: $UNHEALTHY"
-        WARNINGS+=("ZFS pool unhealthy")
+        WARNINGS+=("ZFS pool unhealthy: $UNHEALTHY")
     else
-        success "All ZFS pools are ONLINE"
+        success "All monitored ZFS pools are ONLINE"
+    fi
+
+    # Show ignored pools
+    if [[ ${#ZFS_REPORT_IGNORE_POOLS[@]} -gt 0 ]]; then
+        info "Ignored pools (not reported): ${ZFS_REPORT_IGNORE_POOLS[*]}"
     fi
 fi
 
@@ -130,7 +170,7 @@ else
         warn "ARC utilization ${ARC_PCT}% — above ${ZFS_REPORT_ARC_WARN_PCT}% threshold"
         WARNINGS+=("ARC high: ${ARC_PCT}%")
     else
-        success "ARC utilization ${ARC_PCT}% — within threshold"
+        success "ARC utilization ${ARC_PCT}% — within threshold (${ZFS_REPORT_ARC_WARN_PCT}%)"
     fi
 
     echo ""
@@ -167,14 +207,14 @@ if [[ "$FREE_GB" -lt "$ZFS_REPORT_FREE_WARN_GB" ]]; then
     warn "Free RAM ${FREE_HUMAN} — below ${ZFS_REPORT_FREE_WARN_GB}GB threshold"
     WARNINGS+=("Low free RAM: ${FREE_HUMAN}")
 else
-    success "Free RAM ${FREE_HUMAN} — within threshold"
+    success "Free RAM ${FREE_HUMAN} — within threshold (${ZFS_REPORT_FREE_WARN_GB}GB)"
 fi
 
 if [[ "$AVAIL_GB" -lt "$ZFS_REPORT_AVAIL_WARN_GB" ]]; then
     warn "Available RAM ${AVAIL_HUMAN} — below ${ZFS_REPORT_AVAIL_WARN_GB}GB threshold"
     WARNINGS+=("Low available RAM: ${AVAIL_HUMAN}")
 else
-    success "Available RAM ${AVAIL_HUMAN} — within threshold"
+    success "Available RAM ${AVAIL_HUMAN} — within threshold (${ZFS_REPORT_AVAIL_WARN_GB}GB)"
 fi
 
 # -----------------------------------------------------------------------------------------------
@@ -217,6 +257,8 @@ echo ""
 echo "━━━━━ $ICON_SUMMARY ZFS REPORT SUMMARY ━━━━━"
 echo "$ICON_TIME Duration:  $(format_duration $((END - START)))"
 echo "$ICON_ZFS  Log:       $ZFS_REPORT_LOG"
+[[ ${#ZFS_REPORT_IGNORE_POOLS[@]} -gt 0 ]] && \
+    echo "$ICON_ZFS  Ignored:   ${ZFS_REPORT_IGNORE_POOLS[*]}"
 echo ""
 if [[ ${#WARNINGS[@]} -eq 0 ]]; then
     success "Report complete — no warnings"