Add FVM_CONCURRENCY alert

Add FVM_CONCURRENCY alert if its set higher then 24

node/builder.go

@@ -89,6 +89,7 @@ const (
 
 	// health checks
 	CheckFDLimit
+	CheckFvmConcurrency
 	LegacyMarketsEOL
 
 	// libp2p
@@ -165,6 +166,7 @@ func defaults() []Option {
 		Override(new(dtypes.NodeStartTime), FromVal(dtypes.NodeStartTime(time.Now()))),
 
 		Override(CheckFDLimit, modules.CheckFdLimit(build.DefaultFDLimit)),
+		Override(CheckFvmConcurrency, modules.CheckFvmConcurrency()),
 
 		Override(new(system.MemoryConstraints), modules.MemoryConstraints),
 		Override(InitMemoryWatchdog, modules.MemoryWatchdog),

node/modules/alerts.go

@@ -1,6 +1,9 @@
 package modules
 
 import (
+	"os"
+	"strconv"
+
 	"github.com/filecoin-project/lotus/journal/alerting"
 	"github.com/filecoin-project/lotus/lib/ulimit"
 )
@@ -42,6 +45,35 @@ func LegacyMarketsEOL(al *alerting.Alerting) {
 	})
 }
 
+func CheckFvmConcurrency() func(al *alerting.Alerting) {
+	return func(al *alerting.Alerting) {
+		fvmConcurrency, ok := os.LookupEnv("LOTUS_FVM_CONCURRENCY")
+		if !ok {
+			return
+		}
+
+		fvmConcurrencyVal, err := strconv.Atoi(fvmConcurrency)
+		if err != nil {
+			alert := al.AddAlertType("process", "fvm-concurrency")
+			al.Raise(alert, map[string]string{
+				"message": "LOTUS_FVM_CONCURRENCY is not an integer",
+				"error":   err.Error(),
+			})
+			return
+		}
+
+		// Raise alert if LOTUS_FVM_CONCURRENCY is set to a high value
+		if fvmConcurrencyVal >= 24 {
+			alert := al.AddAlertType("process", "fvm-concurrency")
+			al.Raise(alert, map[string]interface{}{
+				"message":     "LOTUS_FVM_CONCURRENCY is set to a high value that can cause chain sync panics on network migrations/upgrades",
+				"set_value":   fvmConcurrencyVal,
+				"recommended": "23 or less during network upgrades",
+			})
+		}
+	}
+}
+
 // TODO: More things:
 //  * Space in repo dirs (taking into account mounts)
 //  * Miner