Add option to tetra to filter on event types

This PR adds the ability to filter on the event types.

cmd/tetra/getevents/getevents.go

@@ -41,6 +41,7 @@ type Opts struct {
 	Output        string
 	Color         string
 	IncludeFields []string
+	EventTypes    []string
 	ExcludeFields []string
 	Namespaces    []string
 	Namespace     []string // deprecated: use Namespaces
@@ -87,6 +88,14 @@ var GetFilter = func() *tetragon.Filter {
 		filter.PodRegex = Options.Pods
 	}
 
+	if len(Options.EventTypes) > 0 {
+		var e tetragon.EventType
+		for _, eventType := range Options.EventTypes {
+			e = tetragon.EventType(tetragon.EventType_value[eventType])
+			filter.EventSet = append(filter.EventSet, e)
+		}
+	}
+
 	return &filter
 }
 
@@ -174,6 +183,7 @@ func New() *cobra.Command {
 	flags.StringVarP(&Options.Output, common.KeyOutput, "o", "json", "Output format. json or compact")
 	flags.StringVar(&Options.Color, "color", "auto", "Colorize compact output. auto, always, or never")
 	flags.StringSliceVarP(&Options.IncludeFields, "include-fields", "f", nil, "Include only fields in events")
+	flags.StringSliceVarP(&Options.EventTypes, "event-types", "e", nil, "Include only events of given types")
 	flags.StringSliceVarP(&Options.ExcludeFields, "exclude-fields", "F", nil, "Exclude fields from events")
 
 	flags.StringSliceVarP(&Options.Namespaces, "namespaces", "n", nil, "Get events by Kubernetes namespaces")