Fix 500 errors when requesting with an invalid or unknown monitor parameter

go.mod

@@ -1,8 +1,6 @@
 module go.ntppool.org/data-api
 
-go 1.22.2
-
-toolchain go1.22.5
+go 1.22.5
 
 // replace github.com/samber/slog-echo => github.com/abh/slog-echo v0.0.0-20231024051244-af740639893e
 
@@ -12,7 +10,7 @@ require (
 	github.com/hashicorp/go-retryablehttp v0.7.7
 	github.com/labstack/echo-contrib v0.17.1
 	github.com/labstack/echo/v4 v4.12.0
-	github.com/samber/slog-echo v1.14.3
+	github.com/samber/slog-echo v1.14.4
 	github.com/spf13/cobra v1.8.1
 	github.com/stretchr/testify v1.9.0
 	go.ntppool.org/api v0.3.3
@@ -40,7 +38,6 @@ require (
 	github.com/go-logr/logr v1.4.2 // indirect
 	github.com/go-logr/stdr v1.2.2 // indirect
 	github.com/golang-jwt/jwt v3.2.2+incompatible // indirect
-	github.com/golang/protobuf v1.5.4 // indirect
 	github.com/google/uuid v1.6.0 // indirect
 	github.com/grpc-ecosystem/grpc-gateway/v2 v2.20.0 // indirect
 	github.com/hashicorp/go-cleanhttp v0.5.2 // indirect
@@ -72,7 +69,6 @@ require (
 	go.opentelemetry.io/otel/sdk v1.28.0 // indirect
 	go.opentelemetry.io/proto/otlp v1.3.1 // indirect
 	golang.org/x/crypto v0.25.0 // indirect
-	golang.org/x/exp v0.0.0-20240716175740-e3f259677ff7 // indirect
 	golang.org/x/mod v0.19.0 // indirect
 	golang.org/x/net v0.27.0 // indirect
 	golang.org/x/sys v0.22.0 // indirect