wire in the new 'limits.Agent' infrastructure; extend the 'metrics.Agent' to support additional 'metrics.UsageSink' instances (#271)

controller/limits/agent.go

@@ -0,0 +1,27 @@
+package limits
+
+import (
+	"github.com/openziti/zrok/controller/metrics"
+	"github.com/openziti/zrok/controller/store"
+	"github.com/openziti/zrok/controller/zrokEdgeSdk"
+	"github.com/sirupsen/logrus"
+)
+
+type Agent struct {
+}
+
+func NewAgent(cfg *Config, ifxCfg *metrics.InfluxConfig, zCfg *zrokEdgeSdk.Config, str *store.Store) (*Agent, error) {
+	return &Agent{}, nil
+}
+
+func (a *Agent) Start() error {
+	return nil
+}
+
+func (a *Agent) Stop() {
+}
+
+func (a *Agent) Handle(u *metrics.Usage) error {
+	logrus.Infof("handling: %v", u)
+	return nil
+}