lib/promscrape: split docker and dockerswarm service discovery code bases, since they have very little in common

This is a follow up after c85a5b7fcb

docs/CHANGELOG.md

@@ -6,6 +6,7 @@ sort: 15
 
 ## tip
 
+* FEATURE: vmagent: add service discovery for Docker (aka [docker_sd_config](https://prometheus.io/docs/prometheus/latest/configuration/configuration/#docker_sd_config)). See [this pull request](https://github.com/VictoriaMetrics/VictoriaMetrics/pull/1402).
 * FEATURE: vmagent: add service discovery for DigitalOcean (aka [digitalocean_sd_config](https://prometheus.io/docs/prometheus/latest/configuration/configuration/#digitalocean_sd_config)). See [this feature request](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/1367).
 * FEATURE: vmagent: change the default value for `-remoteWrite.queues` from 4 to `2 * numCPUs`. This should reduce scrape duration for highly loaded vmagent, which scrapes tens of thousands of targets. See [this pull request](https://github.com/VictoriaMetrics/VictoriaMetrics/pull/1385).
 * FEATURE: vmagent: show the number of samples the target returned during the last scrape on `/targets` and `/api/v1/targets` pages. This should simplify debugging targets, which may return too big or too low number of samples. See [this feature request](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/1377).

lib/promscrape/config.go

@@ -22,6 +22,7 @@ import (
 	"github.com/VictoriaMetrics/VictoriaMetrics/lib/promscrape/discovery/digitalocean"
 	"github.com/VictoriaMetrics/VictoriaMetrics/lib/promscrape/discovery/dns"
 	"github.com/VictoriaMetrics/VictoriaMetrics/lib/promscrape/discovery/docker"
+	"github.com/VictoriaMetrics/VictoriaMetrics/lib/promscrape/discovery/dockerswarm"
 	"github.com/VictoriaMetrics/VictoriaMetrics/lib/promscrape/discovery/ec2"
 	"github.com/VictoriaMetrics/VictoriaMetrics/lib/promscrape/discovery/eureka"
 	"github.com/VictoriaMetrics/VictoriaMetrics/lib/promscrape/discovery/gce"
@@ -122,8 +123,8 @@ type ScrapeConfig struct {
 	ConsulSDConfigs       []consul.SDConfig       `yaml:"consul_sd_configs,omitempty"`
 	DigitaloceanSDConfigs []digitalocean.SDConfig `yaml:"digitalocean_sd_configs,omitempty"`
 	DNSSDConfigs          []dns.SDConfig          `yaml:"dns_sd_configs,omitempty"`
-	DockerSDConfigs       []docker.DockerSDConfig      `yaml:"docker_sd_configs,omitempty"`
-	DockerSwarmSDConfigs  []docker.DockerSwarmSDConfig `yaml:"dockerswarm_sd_configs,omitempty"`
+	DockerSDConfigs       []docker.SDConfig       `yaml:"docker_sd_configs,omitempty"`
+	DockerSwarmSDConfigs  []dockerswarm.SDConfig  `yaml:"dockerswarm_sd_configs,omitempty"`
 	EC2SDConfigs          []ec2.SDConfig          `yaml:"ec2_sd_configs,omitempty"`
 	EurekaSDConfigs       []eureka.SDConfig       `yaml:"eureka_sd_configs,omitempty"`
 	FileSDConfigs         []FileSDConfig          `yaml:"file_sd_configs,omitempty"`

lib/promscrape/discovery/docker/api.go

@@ -20,7 +20,7 @@ type apiConfig struct {
 	filtersQueryArg string
 }
 
-func getAPIConfigFromDockerSDConfig(sdc *DockerSDConfig, baseDir string) (*apiConfig, error) {
+func getAPIConfig(sdc *SDConfig, baseDir string) (*apiConfig, error) {
 	v, err := configMap.Get(sdc, func() (interface{}, error) { return newAPIConfig(sdc, baseDir) })
 	if err != nil {
 		return nil, err
@@ -28,19 +28,14 @@ func getAPIConfigFromDockerSDConfig(sdc *DockerSDConfig, baseDir string) (*apiCo
 	return v.(*apiConfig), nil
 }
 
-func getAPIConfigFromDockerSwarmSDConfig(sdc *DockerSwarmSDConfig, baseDir string) (*apiConfig, error) {
-	v, err := configMap.Get(sdc, func() (interface{}, error) { return newAPIConfig(&sdc.DockerSDConfig, baseDir) })
-	if err != nil {
-		return nil, err
-	}
-	return v.(*apiConfig), nil
-}
-
-func newAPIConfig(sdc *DockerSDConfig, baseDir string) (*apiConfig, error) {
+func newAPIConfig(sdc *SDConfig, baseDir string) (*apiConfig, error) {
 	cfg := &apiConfig{
 		port:            sdc.Port,
 		filtersQueryArg: getFiltersQueryArg(sdc.Filters),
 	}
+	if cfg.port == 0 {
+		cfg.port = 80
+	}
 	ac, err := sdc.HTTPClientConfig.NewConfig(baseDir)
 	if err != nil {
 		return nil, fmt.Errorf("cannot parse auth config: %w", err)

lib/promscrape/discovery/docker/container.go

@@ -31,12 +31,10 @@ type container struct {
 }
 
 func getContainersLabels(cfg *apiConfig) ([]map[string]string, error) {
-	networkLabels, err := getNetworksLabels(cfg, "__meta_docker_")
-
+	networkLabels, err := getNetworksLabelsByNetworkID(cfg)
 	if err != nil {
 		return nil, err
 	}
-
 	containers, err := getContainers(cfg)
 	if err != nil {
 		return nil, err
@@ -62,71 +60,52 @@ func parseContainers(data []byte) ([]container, error) {
 
 func addContainersLabels(containers []container, networkLabels map[string]map[string]string, defaultPort int) []map[string]string {
 	var ms []map[string]string
-	for _, c := range containers {
-		if c.Names == nil || len(c.Names) == 0 {
+	for i := range containers {
+		c := &containers[i]
+		if len(c.Names) == 0 {
 			continue
 		}
-
-		commonLabels := map[string]string{
-			"__meta_docker_container_id":           c.Id,
-			"__meta_docker_container_name":         c.Names[0],
-			"__meta_docker_container_network_mode": c.HostConfig.NetworkMode,
-		}
-
-		for k, v := range c.Labels {
-			commonLabels["__meta_docker_container_label_"+discoveryutils.SanitizeLabelName(k)] = v
-		}
-
-		for _, network := range c.NetworkSettings.Networks {
+		for _, n := range c.NetworkSettings.Networks {
 			var added bool
-
-			for _, port := range c.Ports {
-				if port.Type != "tcp" {
+			for _, p := range c.Ports {
+				if p.Type != "tcp" {
 					continue
 				}
-
-				labels := map[string]string{
-					"__meta_docker_network_ip":   network.IPAddress,
-					"__meta_docker_port_private": strconv.FormatInt(int64(port.PrivatePort), 10),
+				m := map[string]string{
+					"__address__":                discoveryutils.JoinHostPort(n.IPAddress, p.PrivatePort),
+					"__meta_docker_network_ip":   n.IPAddress,
+					"__meta_docker_port_private": strconv.Itoa(p.PrivatePort),
 				}
-
-				if port.PublicPort > 0 {
-					labels["__meta_docker_port_public"] = strconv.FormatInt(int64(port.PublicPort), 10)
-					labels["__meta_docker_port_public_ip"] = port.IP
+				if p.PublicPort > 0 {
+					m["__meta_docker_port_public"] = strconv.Itoa(p.PublicPort)
+					m["__meta_docker_port_public_ip"] = p.IP
 				}
-
-				for k, v := range commonLabels {
-					labels[k] = v
-				}
-
-				for k, v := range networkLabels[network.NetworkID] {
-					labels[k] = v
-				}
-
-				labels["__address__"] = discoveryutils.JoinHostPort(network.IPAddress, port.PrivatePort)
-				ms = append(ms, labels)
-
+				addCommonLabels(m, c, networkLabels[n.NetworkID])
+				ms = append(ms, m)
 				added = true
 			}
-
 			if !added {
 				// Use fallback port when no exposed ports are available or if all are non-TCP
-				labels := map[string]string{
-					"__meta_docker_network_ip": network.IPAddress,
+				m := map[string]string{
+					"__address__":              discoveryutils.JoinHostPort(n.IPAddress, defaultPort),
+					"__meta_docker_network_ip": n.IPAddress,
 				}
-
-				for k, v := range commonLabels {
-					labels[k] = v
-				}
-
-				for k, v := range networkLabels[network.NetworkID] {
-					labels[k] = v
-				}
-
-				labels["__address__"] = discoveryutils.JoinHostPort(network.IPAddress, defaultPort)
-				ms = append(ms, labels)
+				addCommonLabels(m, c, networkLabels[n.NetworkID])
+				ms = append(ms, m)
 			}
 		}
 	}
 	return ms
 }
+
+func addCommonLabels(m map[string]string, c *container, networkLabels map[string]string) {
+	m["__meta_docker_container_id"] = c.Id
+	m["__meta_docker_container_name"] = c.Names[0]
+	m["__meta_docker_container_network_mode"] = c.HostConfig.NetworkMode
+	for k, v := range c.Labels {
+		m["__meta_docker_container_label_"+discoveryutils.SanitizeLabelName(k)] = v
+	}
+	for k, v := range networkLabels {
+		m[k] = v
+	}
+}

lib/promscrape/discovery/docker/container_test.go

@@ -309,7 +309,7 @@ func Test_addContainerLabels(t *testing.T) {
 	if err != nil {
 		t.Fatalf("fail to parse networks: %v", err)
 	}
-	networkLabels := getNetworkLabelsGroupByNetworkID(networks, "__meta_docker_")
+	networkLabels := getNetworkLabelsByNetworkID(networks)
 
 	tests := []struct {
 		name    string

lib/promscrape/discovery/docker/docker.go

@@ -14,15 +14,10 @@ var SDCheckInterval = flag.Duration("promscrape.dockerSDCheckInterval", 30*time.
 	"This works only if docker_sd_configs is configured in '-promscrape.config' file. "+
 	"See https://prometheus.io/docs/prometheus/latest/configuration/configuration/#docker_sd_config for details")
 
-// SwarmSDCheckInterval defines interval for dockerswarm targets refresh.
-var SwarmSDCheckInterval = flag.Duration("promscrape.dockerswarmSDCheckInterval", 30*time.Second, "Interval for checking for changes in dockerswarm. "+
-	"This works only if dockerswarm_sd_configs is configured in '-promscrape.config' file. "+
-	"See https://prometheus.io/docs/prometheus/latest/configuration/configuration/#dockerswarm_sd_config for details")
-
-// DockerSDConfig defines the `docker_sd` section for Docker based discovery
+// SDConfig defines the `docker_sd` section for Docker based discovery
 //
 // See https://prometheus.io/docs/prometheus/latest/configuration/configuration/#docker_sd_config
-type DockerSDConfig struct {
+type SDConfig struct {
 	Host    string   `yaml:"host"`
 	Port    int      `yaml:"port,omitempty"`
 	Filters []Filter `yaml:"filters,omitempty"`
@@ -40,8 +35,8 @@ type Filter struct {
 }
 
 // GetLabels returns docker labels according to sdc.
-func (sdc *DockerSDConfig) GetLabels(baseDir string) ([]map[string]string, error) {
-	cfg, err := getAPIConfigFromDockerSDConfig(sdc, baseDir)
+func (sdc *SDConfig) GetLabels(baseDir string) ([]map[string]string, error) {
+	cfg, err := getAPIConfig(sdc, baseDir)
 	if err != nil {
 		return nil, fmt.Errorf("cannot get API config: %w", err)
 	}
@@ -49,6 +44,6 @@ func (sdc *DockerSDConfig) GetLabels(baseDir string) ([]map[string]string, error
 }
 
 // MustStop stops further usage for sdc.
-func (sdc *DockerSDConfig) MustStop() {
+func (sdc *SDConfig) MustStop() {
 	configMap.Delete(sdc)
 }

lib/promscrape/discovery/docker/dockerswarm.go

@@ -1,37 +0,0 @@
-package docker
-
-import (
-	"fmt"
-)
-
-// DockerSwarmSDConfig represents docker swarm service discovery configuration
-//
-// See https://prometheus.io/docs/prometheus/latest/configuration/configuration/#dockerswarm_sd_config
-type DockerSwarmSDConfig struct {
-	Role           string `yaml:"role"`
-	DockerSDConfig `yaml:",inline"`
-	// refresh_interval is obtained from `-promscrape.dockerswarmSDCheckInterval` command-line option
-}
-
-// GetLabels returns dockerswarm labels according to sdc.
-func (sdc *DockerSwarmSDConfig) GetLabels(baseDir string) ([]map[string]string, error) {
-	cfg, err := getAPIConfigFromDockerSwarmSDConfig(sdc, baseDir)
-	if err != nil {
-		return nil, fmt.Errorf("cannot get API config: %w", err)
-	}
-	switch sdc.Role {
-	case "tasks":
-		return getTasksLabels(cfg)
-	case "services":
-		return getServicesLabels(cfg)
-	case "nodes":
-		return getNodesLabels(cfg)
-	default:
-		return nil, fmt.Errorf("unexpected `role`: %q; must be one of `tasks`, `services` or `nodes`; skipping it", sdc.Role)
-	}
-}
-
-// MustStop stops further usage for sdc.
-func (sdc *DockerSwarmSDConfig) MustStop() {
-	configMap.Delete(sdc)
-}

lib/promscrape/discovery/docker/network.go

@@ -18,18 +18,18 @@ type network struct {
 	Labels   map[string]string
 }
 
-func getNetworksLabels(cfg *apiConfig, labelPrefix string) (map[string]map[string]string, error) {
+func getNetworksLabelsByNetworkID(cfg *apiConfig) (map[string]map[string]string, error) {
 	networks, err := getNetworks(cfg)
 	if err != nil {
 		return nil, err
 	}
-	return getNetworkLabelsGroupByNetworkID(networks, labelPrefix), nil
+	return getNetworkLabelsByNetworkID(networks), nil
 }
 
 func getNetworks(cfg *apiConfig) ([]network, error) {
 	resp, err := cfg.getAPIResponse("/networks")
 	if err != nil {
-		return nil, fmt.Errorf("cannot query docker/dockerswarm api for networks: %w", err)
+		return nil, fmt.Errorf("cannot query dockerswarm api for networks: %w", err)
 	}
 	return parseNetworks(resp)
 }
@@ -42,18 +42,18 @@ func parseNetworks(data []byte) ([]network, error) {
 	return networks, nil
 }
 
-func getNetworkLabelsGroupByNetworkID(networks []network, labelPrefix string) map[string]map[string]string {
+func getNetworkLabelsByNetworkID(networks []network) map[string]map[string]string {
 	ms := make(map[string]map[string]string)
 	for _, network := range networks {
 		m := map[string]string{
-			labelPrefix + "network_id":       network.ID,
-			labelPrefix + "network_name":     network.Name,
-			labelPrefix + "network_internal": strconv.FormatBool(network.Internal),
-			labelPrefix + "network_ingress":  strconv.FormatBool(network.Ingress),
-			labelPrefix + "network_scope":    network.Scope,
+			"__meta_docker_network_id":       network.ID,
+			"__meta_docker_network_name":     network.Name,
+			"__meta_docker_network_internal": strconv.FormatBool(network.Internal),
+			"__meta_docker_network_ingress":  strconv.FormatBool(network.Ingress),
+			"__meta_docker_network_scope":    network.Scope,
 		}
 		for k, v := range network.Labels {
-			m[labelPrefix+"network_label_"+discoveryutils.SanitizeLabelName(k)] = v
+			m["__meta_docker_network_label_"+discoveryutils.SanitizeLabelName(k)] = v
 		}
 		ms[network.ID] = m
 	}

lib/promscrape/discovery/docker/network_test.go

@@ -35,18 +35,18 @@ func Test_addNetworkLabels(t *testing.T) {
 			},
 			want: [][]prompbmarshal.Label{
 				discoveryutils.GetSortedLabels(map[string]string{
-					"__meta_dockerswarm_network_id":         "qs0hog6ldlei9ct11pr3c77v1",
-					"__meta_dockerswarm_network_ingress":    "true",
-					"__meta_dockerswarm_network_internal":   "false",
-					"__meta_dockerswarm_network_label_key1": "value1",
-					"__meta_dockerswarm_network_name":       "ingress",
-					"__meta_dockerswarm_network_scope":      "swarm",
+					"__meta_docker_network_id":         "qs0hog6ldlei9ct11pr3c77v1",
+					"__meta_docker_network_ingress":    "true",
+					"__meta_docker_network_internal":   "false",
+					"__meta_docker_network_label_key1": "value1",
+					"__meta_docker_network_name":       "ingress",
+					"__meta_docker_network_scope":      "swarm",
 				})},
 		},
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
-			got := getNetworkLabelsGroupByNetworkID(tt.args.networks, "__meta_dockerswarm_")
+			got := getNetworkLabelsByNetworkID(tt.args.networks)
 			var networkIDs []string
 			for networkID := range got {
 				networkIDs = append(networkIDs, networkID)

lib/promscrape/discovery/dockerswarm/api.go

@@ -0,0 +1,86 @@
+package dockerswarm
+
+import (
+	"encoding/json"
+	"fmt"
+	"net/url"
+	"strings"
+
+	"github.com/VictoriaMetrics/VictoriaMetrics/lib/logger"
+	"github.com/VictoriaMetrics/VictoriaMetrics/lib/promscrape/discoveryutils"
+)
+
+var configMap = discoveryutils.NewConfigMap()
+
+type apiConfig struct {
+	client *discoveryutils.Client
+	port   int
+
+	// filtersQueryArg contains escaped `filters` query arg to add to each request to Docker Swarm API.
+	filtersQueryArg string
+}
+
+func getAPIConfig(sdc *SDConfig, baseDir string) (*apiConfig, error) {
+	v, err := configMap.Get(sdc, func() (interface{}, error) { return newAPIConfig(sdc, baseDir) })
+	if err != nil {
+		return nil, err
+	}
+	return v.(*apiConfig), nil
+}
+
+func newAPIConfig(sdc *SDConfig, baseDir string) (*apiConfig, error) {
+	cfg := &apiConfig{
+		port:            sdc.Port,
+		filtersQueryArg: getFiltersQueryArg(sdc.Filters),
+	}
+	if cfg.port == 0 {
+		cfg.port = 80
+	}
+	ac, err := sdc.HTTPClientConfig.NewConfig(baseDir)
+	if err != nil {
+		return nil, fmt.Errorf("cannot parse auth config: %w", err)
+	}
+	proxyAC, err := sdc.ProxyClientConfig.NewConfig(baseDir)
+	if err != nil {
+		return nil, fmt.Errorf("cannot parse proxy auth config: %w", err)
+	}
+	client, err := discoveryutils.NewClient(sdc.Host, ac, sdc.ProxyURL, proxyAC)
+	if err != nil {
+		return nil, fmt.Errorf("cannot create HTTP client for %q: %w", sdc.Host, err)
+	}
+	cfg.client = client
+	return cfg, nil
+}
+
+func (cfg *apiConfig) getAPIResponse(path string) ([]byte, error) {
+	if len(cfg.filtersQueryArg) > 0 {
+		separator := "?"
+		if strings.Contains(path, "?") {
+			separator = "&"
+		}
+		path += separator + "filters=" + cfg.filtersQueryArg
+	}
+	return cfg.client.GetAPIResponse(path)
+}
+
+func getFiltersQueryArg(filters []Filter) string {
+	if len(filters) == 0 {
+		return ""
+	}
+	m := make(map[string]map[string]bool)
+	for _, f := range filters {
+		x := m[f.Name]
+		if x == nil {
+			x = make(map[string]bool)
+			m[f.Name] = x
+		}
+		for _, value := range f.Values {
+			x[value] = true
+		}
+	}
+	buf, err := json.Marshal(m)
+	if err != nil {
+		logger.Panicf("BUG: unexpected error in json.Marshal: %s", err)
+	}
+	return url.QueryEscape(string(buf))
+}

lib/promscrape/discovery/dockerswarm/api_test.go

@@ -0,0 +1,26 @@
+package dockerswarm
+
+import (
+	"testing"
+)
+
+func TestGetFiltersQueryArg(t *testing.T) {
+	f := func(filters []Filter, queryArgExpected string) {
+		t.Helper()
+		queryArg := getFiltersQueryArg(filters)
+		if queryArg != queryArgExpected {
+			t.Fatalf("unexpected query arg; got %s; want %s", queryArg, queryArgExpected)
+		}
+	}
+	f(nil, "")
+	f([]Filter{
+		{
+			Name:   "name",
+			Values: []string{"foo", "bar"},
+		},
+		{
+			Name:   "xxx",
+			Values: []string{"aa"},
+		},
+	}, "%7B%22name%22%3A%7B%22bar%22%3Atrue%2C%22foo%22%3Atrue%7D%2C%22xxx%22%3A%7B%22aa%22%3Atrue%7D%7D")
+}

lib/promscrape/discovery/dockerswarm/dockerswarm.go

@@ -0,0 +1,59 @@
+package dockerswarm
+
+import (
+	"flag"
+	"fmt"
+	"time"
+
+	"github.com/VictoriaMetrics/VictoriaMetrics/lib/promauth"
+	"github.com/VictoriaMetrics/VictoriaMetrics/lib/proxy"
+)
+
+// SDCheckInterval defines interval for dockerswarm targets refresh.
+var SDCheckInterval = flag.Duration("promscrape.dockerswarmSDCheckInterval", 30*time.Second, "Interval for checking for changes in dockerswarm. "+
+	"This works only if dockerswarm_sd_configs is configured in '-promscrape.config' file. "+
+	"See https://prometheus.io/docs/prometheus/latest/configuration/configuration/#dockerswarm_sd_config for details")
+
+// SDConfig represents docker swarm service discovery configuration
+//
+// See https://prometheus.io/docs/prometheus/latest/configuration/configuration/#dockerswarm_sd_config
+type SDConfig struct {
+	Host    string   `yaml:"host"`
+	Role    string   `yaml:"role"`
+	Port    int      `yaml:"port,omitempty"`
+	Filters []Filter `yaml:"filters,omitempty"`
+
+	HTTPClientConfig  promauth.HTTPClientConfig  `yaml:",inline"`
+	ProxyURL          proxy.URL                  `yaml:"proxy_url,omitempty"`
+	ProxyClientConfig promauth.ProxyClientConfig `yaml:",inline"`
+	// refresh_interval is obtained from `-promscrape.dockerswarmSDCheckInterval` command-line option
+}
+
+// Filter is a filter, which can be passed to SDConfig.
+type Filter struct {
+	Name   string   `yaml:"name"`
+	Values []string `yaml:"values"`
+}
+
+// GetLabels returns dockerswarm labels according to sdc.
+func (sdc *SDConfig) GetLabels(baseDir string) ([]map[string]string, error) {
+	cfg, err := getAPIConfig(sdc, baseDir)
+	if err != nil {
+		return nil, fmt.Errorf("cannot get API config: %w", err)
+	}
+	switch sdc.Role {
+	case "tasks":
+		return getTasksLabels(cfg)
+	case "services":
+		return getServicesLabels(cfg)
+	case "nodes":
+		return getNodesLabels(cfg)
+	default:
+		return nil, fmt.Errorf("unexpected `role`: %q; must be one of `tasks`, `services` or `nodes`; skipping it", sdc.Role)
+	}
+}
+
+// MustStop stops further usage for sdc.
+func (sdc *SDConfig) MustStop() {
+	configMap.Delete(sdc)
+}

lib/promscrape/discovery/dockerswarm/network.go

@@ -0,0 +1,61 @@
+package dockerswarm
+
+import (
+	"encoding/json"
+	"fmt"
+	"strconv"
+
+	"github.com/VictoriaMetrics/VictoriaMetrics/lib/promscrape/discoveryutils"
+)
+
+// See https://docs.docker.com/engine/api/v1.40/#tag/Network
+type network struct {
+	ID       string
+	Name     string
+	Scope    string
+	Internal bool
+	Ingress  bool
+	Labels   map[string]string
+}
+
+func getNetworksLabelsByNetworkID(cfg *apiConfig) (map[string]map[string]string, error) {
+	networks, err := getNetworks(cfg)
+	if err != nil {
+		return nil, err
+	}
+	return getNetworkLabelsByNetworkID(networks), nil
+}
+
+func getNetworks(cfg *apiConfig) ([]network, error) {
+	resp, err := cfg.getAPIResponse("/networks")
+	if err != nil {
+		return nil, fmt.Errorf("cannot query dockerswarm api for networks: %w", err)
+	}
+	return parseNetworks(resp)
+}
+
+func parseNetworks(data []byte) ([]network, error) {
+	var networks []network
+	if err := json.Unmarshal(data, &networks); err != nil {
+		return nil, fmt.Errorf("cannot parse networks: %w", err)
+	}
+	return networks, nil
+}
+
+func getNetworkLabelsByNetworkID(networks []network) map[string]map[string]string {
+	ms := make(map[string]map[string]string)
+	for _, network := range networks {
+		m := map[string]string{
+			"__meta_dockerswarm_network_id":       network.ID,
+			"__meta_dockerswarm_network_name":     network.Name,
+			"__meta_dockerswarm_network_internal": strconv.FormatBool(network.Internal),
+			"__meta_dockerswarm_network_ingress":  strconv.FormatBool(network.Ingress),
+			"__meta_dockerswarm_network_scope":    network.Scope,
+		}
+		for k, v := range network.Labels {
+			m["__meta_dockerswarm_network_label_"+discoveryutils.SanitizeLabelName(k)] = v
+		}
+		ms[network.ID] = m
+	}
+	return ms
+}

lib/promscrape/discovery/dockerswarm/network_test.go

@@ -0,0 +1,173 @@
+package dockerswarm
+
+import (
+	"reflect"
+	"sort"
+	"testing"
+
+	"github.com/VictoriaMetrics/VictoriaMetrics/lib/prompbmarshal"
+	"github.com/VictoriaMetrics/VictoriaMetrics/lib/promscrape/discoveryutils"
+)
+
+func Test_addNetworkLabels(t *testing.T) {
+	type args struct {
+		networks []network
+	}
+	tests := []struct {
+		name string
+		args args
+		want [][]prompbmarshal.Label
+	}{
+		{
+			name: "ingress network",
+			args: args{
+				networks: []network{
+					{
+						ID:      "qs0hog6ldlei9ct11pr3c77v1",
+						Ingress: true,
+						Scope:   "swarm",
+						Name:    "ingress",
+						Labels: map[string]string{
+							"key1": "value1",
+						},
+					},
+				},
+			},
+			want: [][]prompbmarshal.Label{
+				discoveryutils.GetSortedLabels(map[string]string{
+					"__meta_dockerswarm_network_id":         "qs0hog6ldlei9ct11pr3c77v1",
+					"__meta_dockerswarm_network_ingress":    "true",
+					"__meta_dockerswarm_network_internal":   "false",
+					"__meta_dockerswarm_network_label_key1": "value1",
+					"__meta_dockerswarm_network_name":       "ingress",
+					"__meta_dockerswarm_network_scope":      "swarm",
+				})},
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := getNetworkLabelsByNetworkID(tt.args.networks)
+			var networkIDs []string
+			for networkID := range got {
+				networkIDs = append(networkIDs, networkID)
+			}
+			sort.Strings(networkIDs)
+			var sortedLabelss [][]prompbmarshal.Label
+			for _, networkID := range networkIDs {
+				labels := got[networkID]
+				sortedLabelss = append(sortedLabelss, discoveryutils.GetSortedLabels(labels))
+			}
+			if !reflect.DeepEqual(sortedLabelss, tt.want) {
+				t.Errorf("addNetworkLabels() \ngot %v, \nwant %v", sortedLabelss, tt.want)
+			}
+		})
+	}
+}
+
+func Test_parseNetworks(t *testing.T) {
+	type args struct {
+		data []byte
+	}
+	tests := []struct {
+		name    string
+		args    args
+		want    []network
+		wantErr bool
+	}{
+		{
+			name: "parse two networks",
+			args: args{
+				data: []byte(`[
+  {
+    "Name": "ingress",
+    "Id": "qs0hog6ldlei9ct11pr3c77v1",
+    "Created": "2020-10-06T08:39:58.957083331Z",
+    "Scope": "swarm",
+    "Driver": "overlay",
+    "EnableIPv6": false,
+    "IPAM": {
+      "Driver": "default",
+      "Options": null,
+      "Config": [
+        {
+          "Subnet": "10.0.0.0/24",
+          "Gateway": "10.0.0.1"
+        }
+      ]
+    },
+    "Internal": false,
+    "Attachable": false,
+    "Ingress": true,
+    "ConfigFrom": {
+      "Network": ""
+    },
+    "ConfigOnly": false,
+    "Containers": null,
+    "Options": {
+      "com.docker.network.driver.overlay.vxlanid_list": "4096"
+    },
+    "Labels": {
+      "key1": "value1"
+    }
+  },
+  {
+    "Name": "host",
+    "Id": "317f0384d7e5f5c26304a0b04599f9f54bc08def4d0535059ece89955e9c4b7b",
+    "Created": "2020-10-06T08:39:52.843373136Z",
+    "Scope": "local",
+    "Driver": "host",
+    "EnableIPv6": false,
+    "IPAM": {
+      "Driver": "default",
+      "Options": null,
+      "Config": []
+    },
+    "Internal": false,
+    "Attachable": false,
+    "Ingress": false,
+    "ConfigFrom": {
+      "Network": ""
+    },
+    "ConfigOnly": false,
+    "Containers": {},
+    "Options": {},
+    "Labels": {
+      "key": "value"
+    }
+  }
+]`),
+			},
+			want: []network{
+				{
+					ID:      "qs0hog6ldlei9ct11pr3c77v1",
+					Ingress: true,
+					Scope:   "swarm",
+					Name:    "ingress",
+					Labels: map[string]string{
+						"key1": "value1",
+					},
+				},
+				{
+					ID:    "317f0384d7e5f5c26304a0b04599f9f54bc08def4d0535059ece89955e9c4b7b",
+					Scope: "local",
+					Name:  "host",
+					Labels: map[string]string{
+						"key": "value",
+					},
+				},
+			},
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got, err := parseNetworks(tt.args.data)
+			if (err != nil) != tt.wantErr {
+				t.Errorf("parseNetworks() error = %v, wantErr %v", err, tt.wantErr)
+				return
+			}
+			if !reflect.DeepEqual(got, tt.want) {
+				t.Errorf("parseNetworks() \ngot  %v, \nwant %v", got, tt.want)
+			}
+		})
+	}
+}

lib/promscrape/discovery/dockerswarm/nodes.go

@@ -1,4 +1,4 @@
-package docker
+package dockerswarm
 
 import (
 	"encoding/json"

lib/promscrape/discovery/dockerswarm/nodes_test.go

@@ -1,4 +1,4 @@
-package docker
+package dockerswarm
 
 import (
 	"reflect"

lib/promscrape/discovery/dockerswarm/services.go

@@ -1,4 +1,4 @@
-package docker
+package dockerswarm
 
 import (
 	"encoding/json"
@@ -51,7 +51,7 @@ func getServicesLabels(cfg *apiConfig) ([]map[string]string, error) {
 	if err != nil {
 		return nil, err
 	}
-	networksLabels, err := getNetworksLabels(cfg, "__meta_dockerswarm_")
+	networksLabels, err := getNetworksLabelsByNetworkID(cfg)
 	if err != nil {
 		return nil, err
 	}

lib/promscrape/discovery/dockerswarm/services_test.go

@@ -1,4 +1,4 @@
-package docker
+package dockerswarm
 
 import (
 	"reflect"

lib/promscrape/discovery/dockerswarm/tasks.go

@@ -1,4 +1,4 @@
-package docker
+package dockerswarm
 
 import (
 	"encoding/json"
@@ -44,7 +44,7 @@ func getTasksLabels(cfg *apiConfig) ([]map[string]string, error) {
 	if err != nil {
 		return nil, err
 	}
-	networkLabels, err := getNetworksLabels(cfg, "__meta_dockerswarm_")
+	networkLabels, err := getNetworksLabelsByNetworkID(cfg)
 	if err != nil {
 		return nil, err
 	}

lib/promscrape/discovery/dockerswarm/tasks_test.go

@@ -1,4 +1,4 @@
-package docker
+package dockerswarm
 
 import (
 	"reflect"

lib/promscrape/scraper.go

@@ -15,6 +15,7 @@ import (
 	"github.com/VictoriaMetrics/VictoriaMetrics/lib/promscrape/discovery/digitalocean"
 	"github.com/VictoriaMetrics/VictoriaMetrics/lib/promscrape/discovery/dns"
 	"github.com/VictoriaMetrics/VictoriaMetrics/lib/promscrape/discovery/docker"
+	"github.com/VictoriaMetrics/VictoriaMetrics/lib/promscrape/discovery/dockerswarm"
 	"github.com/VictoriaMetrics/VictoriaMetrics/lib/promscrape/discovery/ec2"
 	"github.com/VictoriaMetrics/VictoriaMetrics/lib/promscrape/discovery/eureka"
 	"github.com/VictoriaMetrics/VictoriaMetrics/lib/promscrape/discovery/gce"
@@ -94,7 +95,7 @@ func runScraper(configFile string, pushData func(wr *prompbmarshal.WriteRequest)
 	scs.add("digitalocean_sd_configs", *digitalocean.SDCheckInterval, func(cfg *Config, swsPrev []*ScrapeWork) []*ScrapeWork { return cfg.getDigitalOceanDScrapeWork(swsPrev) })
 	scs.add("dns_sd_configs", *dns.SDCheckInterval, func(cfg *Config, swsPrev []*ScrapeWork) []*ScrapeWork { return cfg.getDNSSDScrapeWork(swsPrev) })
 	scs.add("docker_sd_configs", *docker.SDCheckInterval, func(cfg *Config, swsPrev []*ScrapeWork) []*ScrapeWork { return cfg.getDockerSDScrapeWork(swsPrev) })
-	scs.add("dockerswarm_sd_configs", *docker.SwarmSDCheckInterval, func(cfg *Config, swsPrev []*ScrapeWork) []*ScrapeWork { return cfg.getDockerSwarmSDScrapeWork(swsPrev) })
+	scs.add("dockerswarm_sd_configs", *dockerswarm.SDCheckInterval, func(cfg *Config, swsPrev []*ScrapeWork) []*ScrapeWork { return cfg.getDockerSwarmSDScrapeWork(swsPrev) })
 	scs.add("ec2_sd_configs", *ec2.SDCheckInterval, func(cfg *Config, swsPrev []*ScrapeWork) []*ScrapeWork { return cfg.getEC2SDScrapeWork(swsPrev) })
 	scs.add("eureka_sd_configs", *eureka.SDCheckInterval, func(cfg *Config, swsPrev []*ScrapeWork) []*ScrapeWork { return cfg.getEurekaSDScrapeWork(swsPrev) })
 	scs.add("file_sd_configs", *fileSDCheckInterval, func(cfg *Config, swsPrev []*ScrapeWork) []*ScrapeWork { return cfg.getFileSDScrapeWork(swsPrev) })