general: use map[string]struct{} instead of map[string]bool

conntrackfixer/root.go

@@ -178,9 +178,9 @@ func (c *Component) Start() error {
 						if !strings.HasSuffix(string(rport), "/udp") {
 							continue
 						}
-						ports := map[string]bool{}
+						ports := map[string]struct{}{}
 						for _, binding := range bindings {
-							ports[binding.HostPort] = true
+							ports[binding.HostPort] = struct{}{}
 						}
 						for hportStr := range ports {
 							hport, err := strconv.ParseUint(hportStr, 10, 16)

console/sankey.go

@@ -138,10 +138,10 @@ func (c *Component) sankeyHandlerFunc(gc *gin.Context) {
 	completeName := func(name string, index int) string {
 		return fmt.Sprintf("%s: %s", input.Dimensions[index].String(), name)
 	}
-	addedNodes := map[string]bool{}
+	addedNodes := map[string]struct{}{}
 	addNode := func(name string) {
 		if _, ok := addedNodes[name]; !ok {
-			addedNodes[name] = true
+			addedNodes[name] = struct{}{}
 			output.Nodes = append(output.Nodes, name)
 		}
 	}

inlet/geoip/root.go

@@ -125,12 +125,12 @@ func (c *Component) Start() error {
 		c.r.Err(err).Msg("cannot setup watcher for GeoIP databases")
 		return fmt.Errorf("cannot setup watcher: %w", err)
 	}
-	dirs := map[string]bool{}
+	dirs := map[string]struct{}{}
 	if c.config.GeoDatabase != "" {
-		dirs[filepath.Dir(c.config.GeoDatabase)] = true
+		dirs[filepath.Dir(c.config.GeoDatabase)] = struct{}{}
 	}
 	if c.config.ASNDatabase != "" {
-		dirs[filepath.Dir(c.config.ASNDatabase)] = true
+		dirs[filepath.Dir(c.config.ASNDatabase)] = struct{}{}
 	}
 	for k := range dirs {
 		if err := watcher.Add(k); err != nil {

inlet/snmp/poller.go

@@ -26,7 +26,7 @@ type realPoller struct {
 	config pollerConfig
 	clock  clock.Clock
 
-	pendingRequests     map[string]bool
+	pendingRequests     map[string]struct{}
 	pendingRequestsLock sync.Mutex
 	errLogger           reporter.Logger
 	put                 func(exporterIP, exporterName string, ifIndex uint, iface Interface)
@@ -51,7 +51,7 @@ func newPoller(r *reporter.Reporter, config pollerConfig, clock clock.Clock, put
 		r:               r,
 		config:          config,
 		clock:           clock,
-		pendingRequests: make(map[string]bool),
+		pendingRequests: make(map[string]struct{}),
 		errLogger:       r.Sample(reporter.BurstSampler(10*time.Second, 3)),
 		put:             put,
 	}
@@ -97,7 +97,7 @@ func (p *realPoller) Poll(ctx context.Context, exporter string, port uint16, com
 		key := fmt.Sprintf("%s@%d", exporter, ifIndex)
 		_, ok := p.pendingRequests[key]
 		if !ok {
-			p.pendingRequests[key] = true
+			p.pendingRequests[key] = struct{}{}
 			filteredIfIndexes = append(filteredIfIndexes, ifIndex)
 			keys = append(keys, key)
 		}

orchestrator/root.go

@@ -19,7 +19,6 @@ type Component struct {
 
 	serviceLock           sync.Mutex
 	serviceConfigurations map[ServiceType][]interface{}
-	registeredServices    map[ServiceType][]map[string]bool
 }
 
 // Dependencies define the dependencies of the broker.