Feature: only log health when health state changes

internal/healthcheck/handler.go

@@ -29,7 +29,6 @@ func (h *handler) ServeHTTP(responseWriter http.ResponseWriter, request *http.Re
 		return
 	}
 	if err := h.getErr(); err != nil {
-		h.logger.Error(err)
 		http.Error(responseWriter, err.Error(), http.StatusInternalServerError)
 		return
 	}

internal/healthcheck/health.go

@@ -19,7 +19,9 @@ func (s *server) runHealthcheckLoop(ctx context.Context, wg *sync.WaitGroup) {
 		s.handler.setErr(err)
 
 		if previousErr != nil && err == nil {
-			s.logger.Info("passed")
+			s.logger.Info("healthy!")
+		} else if previousErr == nil && err != nil {
+			s.logger.Info("unhealthy: " + err.Error())
 		}
 
 		if err != nil { // try again after 1 second