Merge branch 'master' into dev-2.0-rebase

.codeclimate.yml

@@ -0,0 +1,15 @@
+engines:
+ gofmt:
+   enabled: true
+ golint:
+   enabled: true
+ govet:
+   enabled: true
+ratings:
+ paths:
+ - "**.go"
+exclude_paths:
+- "/storage/remote/remote.pb.go"
+- vendor/
+- web/ui/static/vendor/
+- "/web/ui/bindata.go"

CHANGELOG.md

@@ -1,3 +1,20 @@
+## 1.5.0 / 2017-01-23
+
+* [CHANGE] Use lexicographic order to sort alerts by name.
+* [FEATURE] Add Joyent Triton discovery.
+* [FEATURE] Add scrape targets and alertmanager targets API.
+* [FEATURE] Add various persistence related metrics.
+* [FEATURE] Add various query engine related metrics.
+* [FEATURE] Add ability to limit scrape samples, and related metrics.
+* [FEATURE] Add labeldrop and labelkeep relabelling actions.
+* [FEATURE] Display current working directory on status-page.
+* [ENHANCEMENT] Strictly use ServiceAccount for in cluster configuration on Kubernetes.
+* [ENHANCEMENT] Various performance and memory-management improvements.
+* [BUGFIX] Fix basic auth for alertmanagers configured via flag.
+* [BUGFIX] Don't panic on decoding corrupt data.
+* [BUGFIX] Ignore dotfiles in data directory.
+* [BUGFIX] Abort on intermediate federation errors.
+
 ## 1.4.1 / 2016-11-28
 
 * [BUGFIX] Fix Consul service discovery

README.md

@@ -4,6 +4,8 @@
 [![Docker Repository on Quay](https://quay.io/repository/prometheus/prometheus/status)][quay]
 [![Docker Pulls](https://img.shields.io/docker/pulls/prom/prometheus.svg?maxAge=604800)][hub]
 [![Go Report Card](https://goreportcard.com/badge/github.com/prometheus/prometheus)](https://goreportcard.com/report/github.com/prometheus/prometheus)
+[![Code Climate](https://codeclimate.com/github/prometheus/prometheus/badges/gpa.svg)](https://codeclimate.com/github/prometheus/prometheus)
+[![Issue Count](https://codeclimate.com/github/prometheus/prometheus/badges/issue_count.svg)](https://codeclimate.com/github/prometheus/prometheus)
 
 Visit [prometheus.io](https://prometheus.io) for the full documentation,
 examples and guides.
@@ -82,15 +84,15 @@ The Makefile provides several targets:
 
   * The source code is periodically indexed: [Prometheus Core](http://godoc.org/github.com/prometheus/prometheus).
   * You will find a Travis CI configuration in `.travis.yml`.
-  * All of the core developers are accessible via the [Prometheus Developers Mailinglist](https://groups.google.com/forum/?fromgroups#!forum/prometheus-developers) and the `#prometheus` channel on `irc.freenode.net`.
+  * See the [Community page](https://prometheus.io/community) for how to reach the Prometheus developers and users on various communication channels.
 
 ## Contributing
 
-Refer to [CONTRIBUTING.md](CONTRIBUTING.md)
+Refer to [CONTRIBUTING.md](https://github.com/prometheus/prometheus/blob/master/CONTRIBUTING.md)
 
 ## License
 
-Apache License 2.0, see [LICENSE](LICENSE).
+Apache License 2.0, see [LICENSE](https://github.com/prometheus/prometheus/blob/master/LICENSE).
 
 
 [travis]: https://travis-ci.org/prometheus/prometheus

VERSION

@@ -1 +1 @@
-1.4.1
+1.5.0

cmd/prometheus/config.go

@@ -27,6 +27,8 @@ import (
 
 	"github.com/asaskevich/govalidator"
 	"github.com/prometheus/common/log"
+	"github.com/prometheus/common/model"
+	"github.com/prometheus/prometheus/config"
 	"github.com/prometheus/prometheus/notifier"
 	"github.com/prometheus/prometheus/promql"
 	"github.com/prometheus/prometheus/web"
@@ -226,6 +228,43 @@ func validateAlertmanagerURL(u string) error {
 	return nil
 }
 
+func parseAlertmanagerURLToConfig(us string) (*config.AlertmanagerConfig, error) {
+	u, err := url.Parse(us)
+	if err != nil {
+		return nil, err
+	}
+	acfg := &config.AlertmanagerConfig{
+		Scheme:     u.Scheme,
+		PathPrefix: u.Path,
+		Timeout:    cfg.notifierTimeout,
+		ServiceDiscoveryConfig: config.ServiceDiscoveryConfig{
+			StaticConfigs: []*config.TargetGroup{
+				{
+					Targets: []model.LabelSet{
+						{
+							model.AddressLabel: model.LabelValue(u.Host),
+						},
+					},
+				},
+			},
+		},
+	}
+
+	if u.User != nil {
+		acfg.HTTPClientConfig = config.HTTPClientConfig{
+			BasicAuth: &config.BasicAuth{
+				Username: u.User.Username(),
+			},
+		}
+
+		if password, isSet := u.User.Password(); isSet {
+			acfg.HTTPClientConfig.BasicAuth.Password = password
+		}
+	}
+
+	return acfg, nil
+}
+
 var helpTmpl = `
 usage: prometheus [<args>]
 {{ range $cat, $flags := . }}{{ if ne $cat "." }} == {{ $cat | upper }} =={{ end }}

cmd/prometheus/config_test.go

@@ -52,3 +52,46 @@ func TestParse(t *testing.T) {
 		}
 	}
 }
+
+func TestParseAlertmanagerURLToConfig(t *testing.T) {
+	tests := []struct {
+		url      string
+		username string
+		password string
+	}{
+		{
+			url:      "http://alertmanager.company.com",
+			username: "",
+			password: "",
+		},
+		{
+			url:      "https://user:password@alertmanager.company.com",
+			username: "user",
+			password: "password",
+		},
+	}
+
+	for i, test := range tests {
+		acfg, err := parseAlertmanagerURLToConfig(test.url)
+		if err != nil {
+			t.Errorf("%d. expected alertmanager URL to be valid, got %s", i, err)
+		}
+
+		if acfg.HTTPClientConfig.BasicAuth != nil {
+			if test.username != acfg.HTTPClientConfig.BasicAuth.Username {
+				t.Errorf("%d. expected alertmanagerConfig username to be %q, got %q",
+					i, test.username, acfg.HTTPClientConfig.BasicAuth.Username)
+			}
+
+			if test.password != acfg.HTTPClientConfig.BasicAuth.Password {
+				t.Errorf("%d. expected alertmanagerConfig password to be %q, got %q", i,
+					test.password, acfg.HTTPClientConfig.BasicAuth.Username)
+			}
+			continue
+		}
+
+		if test.username != "" || test.password != "" {
+			t.Errorf("%d. expected alertmanagerConfig to have basicAuth filled, but was not", i)
+		}
+	}
+}

cmd/prometheus/main.go

@@ -20,7 +20,6 @@ import (
 	_ "net/http/pprof" // Comment this line to disable pprof endpoint.
 	"os"
 	"os/signal"
-	"runtime"
 	"runtime/trace"
 	"syscall"
 	"time"
@@ -58,8 +57,6 @@ var (
 
 func init() {
 	prometheus.MustRegister(version.NewCollector("prometheus"))
-	runtime.SetMutexProfileFraction(20)
-	runtime.SetBlockProfileRate(20)
 }
 
 // Main manages the stup and shutdown lifecycle of the entire Prometheus server.

config/config.go

@@ -156,6 +156,13 @@ var (
 		RefreshInterval: model.Duration(5 * time.Minute),
 	}
 
+	// DefaultTritonSDConfig is the default Triton SD configuration.
+	DefaultTritonSDConfig = TritonSDConfig{
+		Port:            9163,
+		RefreshInterval: model.Duration(60 * time.Second),
+		Version:         1,
+	}
+
 	// DefaultRemoteWriteConfig is the default remote write configuration.
 	DefaultRemoteWriteConfig = RemoteWriteConfig{
 		RemoteTimeout: model.Duration(30 * time.Second),
@@ -437,6 +444,8 @@ type ServiceDiscoveryConfig struct {
 	EC2SDConfigs []*EC2SDConfig `yaml:"ec2_sd_configs,omitempty"`
 	// List of Azure service discovery configurations.
 	AzureSDConfigs []*AzureSDConfig `yaml:"azure_sd_configs,omitempty"`
+	// List of Triton service discovery configurations.
+	TritonSDConfigs []*TritonSDConfig `yaml:"triton_sd_configs,omitempty"`
 
 	// Catches all undefined fields and must be empty after parsing.
 	XXX map[string]interface{} `yaml:",inline"`
@@ -497,6 +506,8 @@ type ScrapeConfig struct {
 	MetricsPath string `yaml:"metrics_path,omitempty"`
 	// The URL scheme with which to fetch metrics from targets.
 	Scheme string `yaml:"scheme,omitempty"`
+	// More than this many samples post metric-relabelling will cause the scrape to fail.
+	SampleLimit uint `yaml:"sample_limit,omitempty"`
 
 	// We cannot do proper Go type embedding below as the parser will then parse
 	// values arbitrarily into the overflow maps of further-down types.
@@ -986,6 +997,11 @@ func (c *KubernetesSDConfig) UnmarshalYAML(unmarshal func(interface{}) error) er
 	if c.BasicAuth != nil && (len(c.BearerToken) > 0 || len(c.BearerTokenFile) > 0) {
 		return fmt.Errorf("at most one of basic_auth, bearer_token & bearer_token_file must be configured")
 	}
+	if c.APIServer.URL == nil &&
+		(c.BasicAuth != nil || c.BearerToken != "" || c.BearerTokenFile != "" ||
+			c.TLSConfig.CAFile != "" || c.TLSConfig.CertFile != "" || c.TLSConfig.KeyFile != "") {
+		return fmt.Errorf("to use custom authentication please provide the 'api_server' URL explicitly")
+	}
 	return nil
 }
 
@@ -1086,6 +1102,42 @@ func (c *AzureSDConfig) UnmarshalYAML(unmarshal func(interface{}) error) error {
 	return checkOverflow(c.XXX, "azure_sd_config")
 }
 
+// TritonSDConfig is the configuration for Triton based service discovery.
+type TritonSDConfig struct {
+	Account         string         `yaml:"account"`
+	DNSSuffix       string         `yaml:"dns_suffix"`
+	Endpoint        string         `yaml:"endpoint"`
+	Port            int            `yaml:"port"`
+	RefreshInterval model.Duration `yaml:"refresh_interval,omitempty"`
+	TLSConfig       TLSConfig      `yaml:"tls_config,omitempty"`
+	Version         int            `yaml:"version"`
+	// Catches all undefined fields and must be empty after parsing.
+	XXX map[string]interface{} `yaml:",inline"`
+}
+
+// UnmarshalYAML implements the yaml.Unmarshaler interface.
+func (c *TritonSDConfig) UnmarshalYAML(unmarshal func(interface{}) error) error {
+	*c = DefaultTritonSDConfig
+	type plain TritonSDConfig
+	err := unmarshal((*plain)(c))
+	if err != nil {
+		return err
+	}
+	if c.Account == "" {
+		return fmt.Errorf("Triton SD configuration requires an account")
+	}
+	if c.DNSSuffix == "" {
+		return fmt.Errorf("Triton SD configuration requires a dns_suffix")
+	}
+	if c.Endpoint == "" {
+		return fmt.Errorf("Triton SD configuration requires an endpoint")
+	}
+	if c.RefreshInterval <= 0 {
+		return fmt.Errorf("Triton SD configuration requires RefreshInterval to be a positive integer")
+	}
+	return checkOverflow(c.XXX, "triton_sd_config")
+}
+
 // RelabelAction is the action to be performed on relabeling.
 type RelabelAction string
 

config/config_test.go

@@ -133,6 +133,7 @@ var expectedConf = &Config{
 
 			ScrapeInterval: model.Duration(50 * time.Second),
 			ScrapeTimeout:  model.Duration(5 * time.Second),
+			SampleLimit:    1000,
 
 			HTTPClientConfig: HTTPClientConfig{
 				BasicAuth: &BasicAuth{
@@ -413,6 +414,33 @@ var expectedConf = &Config{
 				},
 			},
 		},
+		{
+			JobName: "service-triton",
+
+			ScrapeInterval: model.Duration(15 * time.Second),
+			ScrapeTimeout:  DefaultGlobalConfig.ScrapeTimeout,
+
+			MetricsPath: DefaultScrapeConfig.MetricsPath,
+			Scheme:      DefaultScrapeConfig.Scheme,
+
+			ServiceDiscoveryConfig: ServiceDiscoveryConfig{
+				TritonSDConfigs: []*TritonSDConfig{
+					{
+
+						Account:         "testAccount",
+						DNSSuffix:       "triton.example.com",
+						Endpoint:        "triton.example.com",
+						Port:            9163,
+						RefreshInterval: model.Duration(60 * time.Second),
+						Version:         1,
+						TLSConfig: TLSConfig{
+							CertFile: "testdata/valid_cert_file",
+							KeyFile:  "testdata/valid_key_file",
+						},
+					},
+				},
+			},
+		},
 	},
 	AlertingConfig: AlertingConfig{
 		AlertmanagerConfigs: []*AlertmanagerConfig{

config/testdata/conf.good.yml

@@ -70,6 +70,8 @@ scrape_configs:
   scrape_interval: 50s
   scrape_timeout:  5s
 
+  sample_limit: 1000
+
   metrics_path: /my_path
   scheme: https
 
@@ -179,6 +181,18 @@ scrape_configs:
     - targets:
       - localhost:9090
 
+- job_name: service-triton
+  triton_sd_configs:
+  - account: 'testAccount'
+    dns_suffix: 'triton.example.com'
+    endpoint: 'triton.example.com'
+    port: 9163
+    refresh_interval: 1m
+    version: 1
+    tls_config:
+      cert_file: testdata/valid_cert_file
+      key_file: testdata/valid_key_file
+
 alerting:
   alertmanagers:
   - scheme: https

consoles/prometheus-overview.html

@@ -46,7 +46,7 @@
   </tr>
   <tr>
     <td>Checkpoint Duration</td>
-    <td>{{ template "prom_query_drilldown" (args (printf "prometheus_local_storage_checkpoint_duration_seconds{job='prometheus',instance='%s'}" .Params.instance) "" "humanizeDuration") }}</td>
+    <td>{{ template "prom_query_drilldown" (args (printf "prometheus_local_storage_checkpoint_last_duration_seconds{job='prometheus',instance='%s'}" .Params.instance) "" "humanizeDuration") }}</td>
   </tr>
 
   <tr>

discovery/discovery.go

@@ -28,6 +28,7 @@ import (
 	"github.com/prometheus/prometheus/discovery/gce"
 	"github.com/prometheus/prometheus/discovery/kubernetes"
 	"github.com/prometheus/prometheus/discovery/marathon"
+	"github.com/prometheus/prometheus/discovery/triton"
 	"github.com/prometheus/prometheus/discovery/zookeeper"
 	"golang.org/x/net/context"
 )
@@ -106,6 +107,14 @@ func ProvidersFromConfig(cfg config.ServiceDiscoveryConfig) map[string]TargetPro
 	for i, c := range cfg.AzureSDConfigs {
 		app("azure", i, azure.NewDiscovery(c))
 	}
+	for i, c := range cfg.TritonSDConfigs {
+		t, err := triton.New(log.With("sd", "triton"), c)
+		if err != nil {
+			log.Errorf("Cannot create Triton discovery: %s", err)
+			continue
+		}
+		app("triton", i, t)
+	}
 	if len(cfg.StaticConfigs) > 0 {
 		app("static", 0, NewStaticProvider(cfg.StaticConfigs))
 	}

discovery/kubernetes/kubernetes.go

@@ -82,11 +82,38 @@ func New(l log.Logger, conf *config.KubernetesSDConfig) (*Kubernetes, error) {
 		err  error
 	)
 	if conf.APIServer.URL == nil {
+		// Use the Kubernetes provided pod service account
+		// as described in https://kubernetes.io/docs/admin/service-accounts-admin/
 		kcfg, err = rest.InClusterConfig()
 		if err != nil {
 			return nil, err
 		}
+		// Because the handling of configuration parameters changes
+		// we should inform the user when their currently configured values
+		// will be ignored due to precedence of InClusterConfig
+		l.Info("Using pod service account via in-cluster config")
+		if conf.TLSConfig.CAFile != "" {
+			l.Warn("Configured TLS CA file is ignored when using pod service account")
+		}
+		if conf.TLSConfig.CertFile != "" || conf.TLSConfig.KeyFile != "" {
+			l.Warn("Configured TLS client certificate is ignored when using pod service account")
+		}
+		if conf.BearerToken != "" {
+			l.Warn("Configured auth token is ignored when using pod service account")
+		}
+		if conf.BasicAuth != nil {
+			l.Warn("Configured basic authentication credentials are ignored when using pod service account")
+		}
 	} else {
+		kcfg = &rest.Config{
+			Host: conf.APIServer.String(),
+			TLSClientConfig: rest.TLSClientConfig{
+				CAFile:   conf.TLSConfig.CAFile,
+				CertFile: conf.TLSConfig.CertFile,
+				KeyFile:  conf.TLSConfig.KeyFile,
+			},
+			Insecure: conf.TLSConfig.InsecureSkipVerify,
+		}
 		token := conf.BearerToken
 		if conf.BearerTokenFile != "" {
 			bf, err := ioutil.ReadFile(conf.BearerTokenFile)
@@ -95,24 +122,15 @@ func New(l log.Logger, conf *config.KubernetesSDConfig) (*Kubernetes, error) {
 			}
 			token = string(bf)
 		}
+		kcfg.BearerToken = token
 
-		kcfg = &rest.Config{
-			Host:        conf.APIServer.String(),
-			BearerToken: token,
-			TLSClientConfig: rest.TLSClientConfig{
-				CAFile: conf.TLSConfig.CAFile,
-			},
+		if conf.BasicAuth != nil {
+			kcfg.Username = conf.BasicAuth.Username
+			kcfg.Password = conf.BasicAuth.Password
 		}
 	}
-	kcfg.UserAgent = "prometheus/discovery"
 
-	if conf.BasicAuth != nil {
-		kcfg.Username = conf.BasicAuth.Username
-		kcfg.Password = conf.BasicAuth.Password
-	}
-	kcfg.TLSClientConfig.CertFile = conf.TLSConfig.CertFile
-	kcfg.TLSClientConfig.KeyFile = conf.TLSConfig.KeyFile
-	kcfg.Insecure = conf.TLSConfig.InsecureSkipVerify
+	kcfg.UserAgent = "prometheus/discovery"
 
 	c, err := kubernetes.NewForConfig(kcfg)
 	if err != nil {

discovery/triton/triton.go

@@ -0,0 +1,169 @@
+// Copyright 2017 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package triton
+
+import (
+	"encoding/json"
+	"fmt"
+	"io/ioutil"
+	"net/http"
+	"time"
+
+	"github.com/prometheus/client_golang/prometheus"
+	"github.com/prometheus/common/log"
+	"github.com/prometheus/common/model"
+	"github.com/prometheus/prometheus/config"
+	"github.com/prometheus/prometheus/util/httputil"
+	"golang.org/x/net/context"
+)
+
+const (
+	tritonLabel             = model.MetaLabelPrefix + "triton_"
+	tritonLabelMachineId    = tritonLabel + "machine_id"
+	tritonLabelMachineAlias = tritonLabel + "machine_alias"
+	tritonLabelMachineImage = tritonLabel + "machine_image"
+	tritonLabelServerId     = tritonLabel + "server_id"
+	namespace               = "prometheus"
+)
+
+var (
+	refreshFailuresCount = prometheus.NewCounter(
+		prometheus.CounterOpts{
+			Name: "prometheus_sd_triton_refresh_failures_total",
+			Help: "The number of Triton-SD scrape failures.",
+		})
+	refreshDuration = prometheus.NewSummary(
+		prometheus.SummaryOpts{
+			Name: "prometheus_sd_triton_refresh_duration_seconds",
+			Help: "The duration of a Triton-SD refresh in seconds.",
+		})
+)
+
+func init() {
+	prometheus.MustRegister(refreshFailuresCount)
+	prometheus.MustRegister(refreshDuration)
+}
+
+type DiscoveryResponse struct {
+	Containers []struct {
+		ServerUUID  string `json:"server_uuid"`
+		VMAlias     string `json:"vm_alias"`
+		VMImageUUID string `json:"vm_image_uuid"`
+		VMUUID      string `json:"vm_uuid"`
+	} `json:"containers"`
+}
+
+// Discovery periodically performs Triton-SD requests. It implements
+// the TargetProvider interface.
+type Discovery struct {
+	client   *http.Client
+	interval time.Duration
+	logger   log.Logger
+	sdConfig *config.TritonSDConfig
+}
+
+// New returns a new Discovery which periodically refreshes its targets.
+func New(logger log.Logger, conf *config.TritonSDConfig) (*Discovery, error) {
+	tls, err := httputil.NewTLSConfig(conf.TLSConfig)
+	if err != nil {
+		return nil, err
+	}
+
+	transport := &http.Transport{TLSClientConfig: tls}
+	client := &http.Client{Transport: transport}
+
+	return &Discovery{
+		client:   client,
+		interval: time.Duration(conf.RefreshInterval),
+		logger:   logger,
+		sdConfig: conf,
+	}, nil
+}
+
+// Run implements the TargetProvider interface.
+func (d *Discovery) Run(ctx context.Context, ch chan<- []*config.TargetGroup) {
+	defer close(ch)
+
+	ticker := time.NewTicker(d.interval)
+	defer ticker.Stop()
+
+	// Get an initial set right away.
+	tg, err := d.refresh()
+	if err != nil {
+		d.logger.With("err", err).Error("Refreshing targets failed")
+	} else {
+		ch <- []*config.TargetGroup{tg}
+	}
+
+	for {
+		select {
+		case <-ticker.C:
+			tg, err := d.refresh()
+			if err != nil {
+				d.logger.With("err", err).Error("Refreshing targets failed")
+			} else {
+				ch <- []*config.TargetGroup{tg}
+			}
+		case <-ctx.Done():
+			return
+		}
+	}
+}
+
+func (d *Discovery) refresh() (tg *config.TargetGroup, err error) {
+	t0 := time.Now()
+	defer func() {
+		refreshDuration.Observe(time.Since(t0).Seconds())
+		if err != nil {
+			refreshFailuresCount.Inc()
+		}
+	}()
+
+	var endpoint = fmt.Sprintf("https://%s:%d/v%d/discover", d.sdConfig.Endpoint, d.sdConfig.Port, d.sdConfig.Version)
+	tg = &config.TargetGroup{
+		Source: endpoint,
+	}
+
+	resp, err := d.client.Get(endpoint)
+	if err != nil {
+		return tg, fmt.Errorf("an error occurred when requesting targets from the discovery endpoint. %s", err)
+	}
+
+	defer resp.Body.Close()
+
+	data, err := ioutil.ReadAll(resp.Body)
+	if err != nil {
+		return tg, fmt.Errorf("an error occurred when reading the response body. %s", err)
+	}
+
+	dr := DiscoveryResponse{}
+	err = json.Unmarshal(data, &dr)
+	if err != nil {
+		return tg, fmt.Errorf("an error occurred unmarshaling the disovery response json. %s", err)
+	}
+
+	for _, container := range dr.Containers {
+		labels := model.LabelSet{
+			tritonLabelMachineId:    model.LabelValue(container.VMUUID),
+			tritonLabelMachineAlias: model.LabelValue(container.VMAlias),
+			tritonLabelMachineImage: model.LabelValue(container.VMImageUUID),
+			tritonLabelServerId:     model.LabelValue(container.ServerUUID),
+		}
+		addr := fmt.Sprintf("%s.%s:%d", container.VMUUID, d.sdConfig.DNSSuffix, d.sdConfig.Port)
+		labels[model.AddressLabel] = model.LabelValue(addr)
+		tg.Targets = append(tg.Targets, labels)
+	}
+
+	return tg, nil
+}

discovery/triton/triton_test.go

@@ -0,0 +1,178 @@
+// Copyright 2016 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package triton
+
+import (
+	"fmt"
+	"net"
+	"net/http"
+	"net/http/httptest"
+	"net/url"
+	"strconv"
+	"testing"
+	"time"
+
+	"github.com/prometheus/common/log"
+	"github.com/prometheus/common/model"
+	"github.com/prometheus/prometheus/config"
+	"github.com/stretchr/testify/assert"
+	"golang.org/x/net/context"
+)
+
+var (
+	conf = config.TritonSDConfig{
+		Account:         "testAccount",
+		DNSSuffix:       "triton.example.com",
+		Endpoint:        "127.0.0.1",
+		Port:            443,
+		Version:         1,
+		RefreshInterval: 1,
+		TLSConfig:       config.TLSConfig{InsecureSkipVerify: true},
+	}
+	badconf = config.TritonSDConfig{
+		Account:         "badTestAccount",
+		DNSSuffix:       "bad.triton.example.com",
+		Endpoint:        "127.0.0.1",
+		Port:            443,
+		Version:         1,
+		RefreshInterval: 1,
+		TLSConfig: config.TLSConfig{
+			InsecureSkipVerify: false,
+			KeyFile:            "shouldnotexist.key",
+			CAFile:             "shouldnotexist.ca",
+			CertFile:           "shouldnotexist.cert",
+		},
+	}
+	logger = log.Base()
+)
+
+func TestTritonSDNew(t *testing.T) {
+	td, err := New(logger, &conf)
+	assert.Nil(t, err)
+	assert.NotNil(t, td)
+	assert.NotNil(t, td.client)
+	assert.NotNil(t, td.interval)
+	assert.NotNil(t, td.logger)
+	assert.Equal(t, logger, td.logger, "td.logger equals logger")
+	assert.NotNil(t, td.sdConfig)
+	assert.Equal(t, conf.Account, td.sdConfig.Account)
+	assert.Equal(t, conf.DNSSuffix, td.sdConfig.DNSSuffix)
+	assert.Equal(t, conf.Endpoint, td.sdConfig.Endpoint)
+	assert.Equal(t, conf.Port, td.sdConfig.Port)
+}
+
+func TestTritonSDNewBadConfig(t *testing.T) {
+	td, err := New(logger, &badconf)
+	assert.NotNil(t, err)
+	assert.Nil(t, td)
+}
+
+func TestTritonSDRun(t *testing.T) {
+	var (
+		td, err     = New(logger, &conf)
+		ch          = make(chan []*config.TargetGroup)
+		ctx, cancel = context.WithCancel(context.Background())
+	)
+
+	assert.Nil(t, err)
+	assert.NotNil(t, td)
+
+	go td.Run(ctx, ch)
+
+	select {
+	case <-time.After(60 * time.Millisecond):
+		// Expected.
+	case tgs := <-ch:
+		t.Fatalf("Unexpected target groups in triton discovery: %s", tgs)
+	}
+
+	cancel()
+}
+
+func TestTritonSDRefreshNoTargets(t *testing.T) {
+	tgts := testTritonSDRefresh(t, "{\"containers\":[]}")
+	assert.Nil(t, tgts)
+}
+
+func TestTritonSDRefreshMultipleTargets(t *testing.T) {
+	var (
+		dstr = `{"containers":[
+		 	{
+				"server_uuid":"44454c4c-5000-104d-8037-b7c04f5a5131",
+				"vm_alias":"server01",
+				"vm_image_uuid":"7b27a514-89d7-11e6-bee6-3f96f367bee7",
+				"vm_uuid":"ad466fbf-46a2-4027-9b64-8d3cdb7e9072"
+			},
+			{
+				"server_uuid":"a5894692-bd32-4ca1-908a-e2dda3c3a5e6",
+				"vm_alias":"server02",
+				"vm_image_uuid":"a5894692-bd32-4ca1-908a-e2dda3c3a5e6",
+				"vm_uuid":"7b27a514-89d7-11e6-bee6-3f96f367bee7"
+			}]
+		}`
+	)
+
+	tgts := testTritonSDRefresh(t, dstr)
+	assert.NotNil(t, tgts)
+	assert.Equal(t, 2, len(tgts))
+}
+
+func TestTritonSDRefreshNoServer(t *testing.T) {
+	var (
+		td, err = New(logger, &conf)
+	)
+	assert.Nil(t, err)
+	assert.NotNil(t, td)
+
+	tg, rerr := td.refresh()
+	assert.NotNil(t, rerr)
+	assert.Contains(t, rerr.Error(), "an error occurred when requesting targets from the discovery endpoint.")
+	assert.NotNil(t, tg)
+	assert.Nil(t, tg.Targets)
+}
+
+func testTritonSDRefresh(t *testing.T, dstr string) []model.LabelSet {
+	var (
+		td, err = New(logger, &conf)
+		s       = httptest.NewTLSServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+			fmt.Fprintln(w, dstr)
+		}))
+	)
+
+	defer s.Close()
+
+	u, uperr := url.Parse(s.URL)
+	assert.Nil(t, uperr)
+	assert.NotNil(t, u)
+
+	host, strport, sherr := net.SplitHostPort(u.Host)
+	assert.Nil(t, sherr)
+	assert.NotNil(t, host)
+	assert.NotNil(t, strport)
+
+	port, atoierr := strconv.Atoi(strport)
+	assert.Nil(t, atoierr)
+	assert.NotNil(t, port)
+
+	td.sdConfig.Port = port
+
+	assert.Nil(t, err)
+	assert.NotNil(t, td)
+
+	tg, err := td.refresh()
+	assert.Nil(t, err)
+	assert.NotNil(t, tg)
+
+	return tg.Targets
+}

notifier/notifier.go

@@ -166,7 +166,7 @@ func New(o *Options) *Notifier {
 			Namespace: namespace,
 			Subsystem: subsystem,
 			Name:      "dropped_total",
-			Help:      "Total number of alerts dropped due to alert manager missing in configuration.",
+			Help:      "Total number of alerts dropped due to errors when sending to Alertmanager.",
 		}),
 		queueLength: prometheus.NewGauge(prometheus.GaugeOpts{
 			Namespace: namespace,

promql/engine.go

@@ -22,6 +22,7 @@ import (
 	"strconv"
 	"time"
 
+	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/common/log"
 	"github.com/prometheus/prometheus/pkg/labels"
 	"github.com/prometheus/prometheus/pkg/timestamp"
@@ -32,12 +33,35 @@ import (
 )
 
 const (
+	namespace = "prometheus"
+	subsystem = "engine"
+
 	// The largest SampleValue that can be converted to an int64 without overflow.
 	maxInt64 = 9223372036854774784
 	// The smallest SampleValue that can be converted to an int64 without underflow.
 	minInt64 = -9223372036854775808
 )
 
+var (
+	currentQueries = prometheus.NewGauge(prometheus.GaugeOpts{
+		Namespace: namespace,
+		Subsystem: subsystem,
+		Name:      "queries",
+		Help:      "The current number of queries being executed or waiting.",
+	})
+	maxConcurrentQueries = prometheus.NewGauge(prometheus.GaugeOpts{
+		Namespace: namespace,
+		Subsystem: subsystem,
+		Name:      "queries_concurrent_max",
+		Help:      "The max number of concurrent queries.",
+	})
+)
+
+func init() {
+	prometheus.MustRegister(currentQueries)
+	prometheus.MustRegister(maxConcurrentQueries)
+}
+
 // convertibleToInt64 returns true if v does not over-/underflow an int64.
 func convertibleToInt64(v float64) bool {
 	return v <= maxInt64 && v >= minInt64
@@ -142,6 +166,7 @@ func NewEngine(queryable Queryable, o *EngineOptions) *Engine {
 	if o == nil {
 		o = DefaultEngineOptions
 	}
+	maxConcurrentQueries.Set(float64(o.MaxConcurrentQueries))
 	return &Engine{
 		queryable: queryable,
 		gate:      newQueryGate(o.MaxConcurrentQueries),
@@ -226,6 +251,9 @@ func (ng *Engine) newTestQuery(f func(context.Context) error) Query {
 // At this point per query only one EvalStmt is evaluated. Alert and record
 // statements are not handled by the Engine.
 func (ng *Engine) exec(ctx context.Context, q *query) (Value, error) {
+	currentQueries.Inc()
+	defer currentQueries.Dec()
+
 	ctx, cancel := context.WithTimeout(ctx, ng.options.Timeout)
 	q.cancel = cancel
 

retrieval/scrape.go

@@ -34,9 +34,10 @@ import (
 )
 
 const (
-	scrapeHealthMetricName   = "up"
-	scrapeDurationMetricName = "scrape_duration_seconds"
-	scrapeSamplesMetricName  = "scrape_samples_scraped"
+	scrapeHealthMetricName       = "up"
+	scrapeDurationMetricName     = "scrape_duration_seconds"
+	scrapeSamplesMetricName      = "scrape_samples_scraped"
+	samplesPostRelabelMetricName = "scrape_samples_post_metric_relabeling"
 )
 
 var (
@@ -77,6 +78,12 @@ var (
 		},
 		[]string{"scrape_job"},
 	)
+	targetScrapeSampleLimit = prometheus.NewCounter(
+		prometheus.CounterOpts{
+			Name: "prometheus_target_scrapes_exceeded_sample_limit_total",
+			Help: "Total number of scrapes that hit the sample limit and were rejected.",
+		},
+	)
 )
 
 func init() {
@@ -85,6 +92,7 @@ func init() {
 	prometheus.MustRegister(targetReloadIntervalLength)
 	prometheus.MustRegister(targetSyncIntervalLength)
 	prometheus.MustRegister(targetScrapePoolSyncsCounter)
+	prometheus.MustRegister(targetScrapeSampleLimit)
 }
 
 // scrapePool manages scrapes for sets of targets.
@@ -285,6 +293,15 @@ func (sp *scrapePool) sampleAppender(target *Target) storage.Appender {
 	if err != nil {
 		panic(err)
 	}
+
+	// The limit is applied after metrics are potentially dropped via relabeling.
+	if sp.config.SampleLimit > 0 {
+		app = &limitAppender{
+			Appender: app,
+			limit:    int(sp.config.SampleLimit),
+		}
+	}
+
 	// The relabelAppender has to be inside the label-modifying appenders
 	// so the relabeling rules are applied to the correct label set.
 	if mrc := sp.config.MetricRelabelConfigs; len(mrc) > 0 {
@@ -427,6 +444,7 @@ func (sl *scrapeLoop) run(interval, timeout time.Duration, errc chan<- error) {
 		}
 
 		var (
+			total, added int
 			start        = time.Now()
 			scrapeCtx, _ = context.WithTimeout(sl.ctx, timeout)
 		)
@@ -438,14 +456,13 @@ func (sl *scrapeLoop) run(interval, timeout time.Duration, errc chan<- error) {
 			)
 		}
 
-		n := 0
 		buf := bytes.NewBuffer(getScrapeBuf())
 
 		err := sl.scraper.scrape(scrapeCtx, buf)
 		if err == nil {
 			b := buf.Bytes()
 
-			if n, err = sl.append(b, start); err != nil {
+			if total, added, err = sl.append(b, start); err != nil {
 				log.With("err", err).Error("append failed")
 			}
 			putScrapeBuf(b)
@@ -453,7 +470,7 @@ func (sl *scrapeLoop) run(interval, timeout time.Duration, errc chan<- error) {
 			errc <- err
 		}
 
-		sl.report(start, time.Since(start), n, err)
+		sl.report(start, time.Since(start), total, added, err)
 		last = start
 
 		select {
@@ -490,7 +507,7 @@ func (s samples) Less(i, j int) bool {
 	return s[i].t < s[j].t
 }
 
-func (sl *scrapeLoop) append(b []byte, ts time.Time) (n int, err error) {
+func (sl *scrapeLoop) append(b []byte, ts time.Time) (total, added int, err error) {
 	var (
 		app     = sl.appender()
 		p       = textparse.New(b)
@@ -498,6 +515,8 @@ func (sl *scrapeLoop) append(b []byte, ts time.Time) (n int, err error) {
 	)
 
 	for p.Next() {
+		total++
+
 		t := defTime
 		met, tp, v := p.At()
 		if tp != nil {
@@ -508,6 +527,7 @@ func (sl *scrapeLoop) append(b []byte, ts time.Time) (n int, err error) {
 		ref, ok := sl.cache[mets]
 		if ok {
 			if err = app.Add(ref, t, v); err == nil {
+				added++
 				continue
 			} else if err != storage.ErrNotFound {
 				break
@@ -517,31 +537,36 @@ func (sl *scrapeLoop) append(b []byte, ts time.Time) (n int, err error) {
 		if !ok {
 			var lset labels.Labels
 			p.Metric(&lset)
+
 			ref, err = app.SetSeries(lset)
+			// TODO(fabxc): also add a dropped-cache?
+			if err == errSeriesDropped {
+				continue
+			}
 			if err != nil {
 				break
 			}
 			if err = app.Add(ref, t, v); err != nil {
 				break
 			}
+			added++
 		}
 		sl.cache[mets] = ref
-		n++
 	}
 	if err == nil {
 		err = p.Err()
 	}
 	if err != nil {
 		app.Rollback()
-		return 0, err
+		return total, 0, err
 	}
 	if err := app.Commit(); err != nil {
-		return 0, err
+		return total, 0, err
 	}
-	return n, nil
+	return total, added, nil
 }
 
-func (sl *scrapeLoop) report(start time.Time, duration time.Duration, scrapedSamples int, err error) error {
+func (sl *scrapeLoop) report(start time.Time, duration time.Duration, scraped, appended int, err error) error {
 	sl.scraper.report(start, duration, err)
 
 	ts := timestamp.FromTime(start)
@@ -561,7 +586,11 @@ func (sl *scrapeLoop) report(start time.Time, duration time.Duration, scrapedSam
 		app.Rollback()
 		return err
 	}
-	if err := sl.addReportSample(app, scrapeSamplesMetricName, ts, float64(scrapedSamples)); err != nil {
+	if err := sl.addReportSample(app, scrapeSamplesMetricName, ts, float64(scraped)); err != nil {
+		app.Rollback()
+		return err
+	}
+	if err := sl.addReportSample(app, samplesPostRelabelMetricName, ts, float64(appended)); err != nil {
 		app.Rollback()
 		return err
 	}

retrieval/scrape_test.go

@@ -285,6 +285,7 @@ func TestScrapePoolSampleAppender(t *testing.T) {
 	}
 
 	cfg.HonorLabels = true
+	cfg.SampleLimit = 100
 	wrapped = sp.sampleAppender(target)
 
 	hl, ok := wrapped.(honorLabelsAppender)
@@ -295,7 +296,11 @@ func TestScrapePoolSampleAppender(t *testing.T) {
 	if !ok {
 		t.Fatalf("Expected relabelAppender but got %T", hl.Appender)
 	}
-	if _, ok := re.Appender.(nopAppender); !ok {
+	lm, ok := re.Appender.(*limitAppender)
+	if !ok {
+		t.Fatalf("Expected limitAppender but got %T", lm.Appender)
+	}
+	if _, ok := lm.Appender.(nopAppender); !ok {
 		t.Fatalf("Expected base appender but got %T", re.Appender)
 	}
 }
@@ -305,7 +310,7 @@ func TestScrapeLoopStop(t *testing.T) {
 	sl := newScrapeLoop(context.Background(), scraper, nil, nil)
 
 	// The scrape pool synchronizes on stopping scrape loops. However, new scrape
-	// loops are syarted asynchronously. Thus it's possible, that a loop is stopped
+	// loops are started asynchronously. Thus it's possible, that a loop is stopped
 	// again before having started properly.
 	// Stopping not-yet-started loops must block until the run method was called and exited.
 	// The run method must exit immediately.

retrieval/target.go

@@ -227,6 +227,26 @@ func (ts Targets) Len() int           { return len(ts) }
 func (ts Targets) Less(i, j int) bool { return ts[i].URL().String() < ts[j].URL().String() }
 func (ts Targets) Swap(i, j int)      { ts[i], ts[j] = ts[j], ts[i] }
 
+// limitAppender limits the number of total appended samples in a batch.
+type limitAppender struct {
+	storage.Appender
+
+	limit int
+	i     int
+}
+
+func (app *limitAppender) Add(ref uint64, t int64, v float64) error {
+	if app.i+1 > app.limit {
+		return errors.New("sample limit exceeded")
+	}
+
+	if err := app.Appender.Add(ref, t, v); err != nil {
+		return fmt.Errorf("sample limit of %d exceeded", app.limit)
+	}
+	app.i++
+	return nil
+}
+
 // Merges the ingested sample's metric with the label set. On a collision the
 // value of the ingested label is stored in a label prefixed with 'exported_'.
 type ruleLabelsAppender struct {

retrieval/targetmanager.go

@@ -136,16 +136,16 @@ func (tm *TargetManager) reload() {
 }
 
 // Targets returns the targets currently being scraped bucketed by their job name.
-func (tm *TargetManager) Targets() []Target {
+func (tm *TargetManager) Targets() []*Target {
 	tm.mtx.RLock()
 	defer tm.mtx.RUnlock()
 
-	targets := []Target{}
+	targets := []*Target{}
 	for _, ps := range tm.targetSets {
 		ps.sp.mtx.RLock()
 
 		for _, t := range ps.sp.targets {
-			targets = append(targets, *t)
+			targets = append(targets, t)
 		}
 
 		ps.sp.mtx.RUnlock()

vendor/github.com/prometheus/common/expfmt/decode.go

@@ -31,6 +31,7 @@ type Decoder interface {
 	Decode(*dto.MetricFamily) error
 }
 
+// DecodeOptions contains options used by the Decoder and in sample extraction.
 type DecodeOptions struct {
 	// Timestamp is added to each value from the stream that has no explicit timestamp set.
 	Timestamp model.Time
@@ -142,6 +143,8 @@ func (d *textDecoder) Decode(v *dto.MetricFamily) error {
 	return nil
 }
 
+// SampleDecoder wraps a Decoder to extract samples from the metric families
+// decoded by the wrapped Decoder.
 type SampleDecoder struct {
 	Dec  Decoder
 	Opts *DecodeOptions
@@ -149,37 +152,51 @@ type SampleDecoder struct {
 	f dto.MetricFamily
 }
 
+// Decode calls the Decode method of the wrapped Decoder and then extracts the
+// samples from the decoded MetricFamily into the provided model.Vector.
 func (sd *SampleDecoder) Decode(s *model.Vector) error {
-	if err := sd.Dec.Decode(&sd.f); err != nil {
+	err := sd.Dec.Decode(&sd.f)
+	if err != nil {
 		return err
 	}
-	*s = extractSamples(&sd.f, sd.Opts)
-	return nil
+	*s, err = extractSamples(&sd.f, sd.Opts)
+	return err
 }
 
-// Extract samples builds a slice of samples from the provided metric families.
-func ExtractSamples(o *DecodeOptions, fams ...*dto.MetricFamily) model.Vector {
-	var all model.Vector
+// ExtractSamples builds a slice of samples from the provided metric
+// families. If an error occurs during sample extraction, it continues to
+// extract from the remaining metric families. The returned error is the last
+// error that has occured.
+func ExtractSamples(o *DecodeOptions, fams ...*dto.MetricFamily) (model.Vector, error) {
+	var (
+		all     model.Vector
+		lastErr error
+	)
 	for _, f := range fams {
-		all = append(all, extractSamples(f, o)...)
+		some, err := extractSamples(f, o)
+		if err != nil {
+			lastErr = err
+			continue
+		}
+		all = append(all, some...)
 	}
-	return all
+	return all, lastErr
 }
 
-func extractSamples(f *dto.MetricFamily, o *DecodeOptions) model.Vector {
+func extractSamples(f *dto.MetricFamily, o *DecodeOptions) (model.Vector, error) {
 	switch f.GetType() {
 	case dto.MetricType_COUNTER:
-		return extractCounter(o, f)
+		return extractCounter(o, f), nil
 	case dto.MetricType_GAUGE:
-		return extractGauge(o, f)
+		return extractGauge(o, f), nil
 	case dto.MetricType_SUMMARY:
-		return extractSummary(o, f)
+		return extractSummary(o, f), nil
 	case dto.MetricType_UNTYPED:
-		return extractUntyped(o, f)
+		return extractUntyped(o, f), nil
 	case dto.MetricType_HISTOGRAM:
-		return extractHistogram(o, f)
+		return extractHistogram(o, f), nil
 	}
-	panic("expfmt.extractSamples: unknown metric family type")
+	return nil, fmt.Errorf("expfmt.extractSamples: unknown metric family type %v", f.GetType())
 }
 
 func extractCounter(o *DecodeOptions, f *dto.MetricFamily) model.Vector {

vendor/github.com/prometheus/common/expfmt/expfmt.go

@@ -11,14 +11,15 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-// A package for reading and writing Prometheus metrics.
+// Package expfmt contains tools for reading and writing Prometheus metrics.
 package expfmt
 
+// Format specifies the HTTP content type of the different wire protocols.
 type Format string
 
+// Constants to assemble the Content-Type values for the different wire protocols.
 const (
-	TextVersion = "0.0.4"
-
+	TextVersion   = "0.0.4"
 	ProtoType     = `application/vnd.google.protobuf`
 	ProtoProtocol = `io.prometheus.client.MetricFamily`
 	ProtoFmt      = ProtoType + "; proto=" + ProtoProtocol + ";"

vendor/github.com/prometheus/common/log/syslog_formatter.go

@@ -23,6 +23,8 @@ import (
 	"github.com/Sirupsen/logrus"
 )
 
+var _ logrus.Formatter = (*syslogger)(nil)
+
 func init() {
 	setSyslogFormatter = func(appname, local string) error {
 		if appname == "" {
@@ -43,7 +45,7 @@ func init() {
 	}
 }
 
-var ceeTag = []byte("@cee:")
+var prefixTag []byte
 
 type syslogger struct {
 	wrap logrus.Formatter
@@ -56,6 +58,11 @@ func newSyslogger(appname string, facility string, fmter logrus.Formatter) (*sys
 		return nil, err
 	}
 	out, err := syslog.New(priority, appname)
+	_, isJSON := fmter.(*logrus.JSONFormatter)
+	if isJSON {
+		// add cee tag to json formatted syslogs
+		prefixTag = []byte("@cee:")
+	}
 	return &syslogger{
 		out:  out,
 		wrap: fmter,
@@ -92,7 +99,7 @@ func (s *syslogger) Format(e *logrus.Entry) ([]byte, error) {
 	}
 	// only append tag to data sent to syslog (line), not to what
 	// is returned
-	line := string(append(ceeTag, data...))
+	line := string(append(prefixTag, data...))
 
 	switch e.Level {
 	case logrus.PanicLevel:

vendor/github.com/prometheus/common/model/labels.go

@@ -80,14 +80,18 @@ const (
 	QuantileLabel = "quantile"
 )
 
-// LabelNameRE is a regular expression matching valid label names.
+// LabelNameRE is a regular expression matching valid label names. Note that the
+// IsValid method of LabelName performs the same check but faster than a match
+// with this regular expression.
 var LabelNameRE = regexp.MustCompile("^[a-zA-Z_][a-zA-Z0-9_]*$")
 
 // A LabelName is a key for a LabelSet or Metric.  It has a value associated
 // therewith.
 type LabelName string
 
-// IsValid is true iff the label name matches the pattern of LabelNameRE.
+// IsValid is true iff the label name matches the pattern of LabelNameRE. This
+// method, however, does not use LabelNameRE for the check but a much faster
+// hardcoded implementation.
 func (ln LabelName) IsValid() bool {
 	if len(ln) == 0 {
 		return false
@@ -106,7 +110,7 @@ func (ln *LabelName) UnmarshalYAML(unmarshal func(interface{}) error) error {
 	if err := unmarshal(&s); err != nil {
 		return err
 	}
-	if !LabelNameRE.MatchString(s) {
+	if !LabelName(s).IsValid() {
 		return fmt.Errorf("%q is not a valid label name", s)
 	}
 	*ln = LabelName(s)
@@ -119,7 +123,7 @@ func (ln *LabelName) UnmarshalJSON(b []byte) error {
 	if err := json.Unmarshal(b, &s); err != nil {
 		return err
 	}
-	if !LabelNameRE.MatchString(s) {
+	if !LabelName(s).IsValid() {
 		return fmt.Errorf("%q is not a valid label name", s)
 	}
 	*ln = LabelName(s)

vendor/github.com/prometheus/common/model/labelset.go

@@ -160,7 +160,7 @@ func (l *LabelSet) UnmarshalJSON(b []byte) error {
 	// LabelName as a string and does not call its UnmarshalJSON method.
 	// Thus, we have to replicate the behavior here.
 	for ln := range m {
-		if !LabelNameRE.MatchString(string(ln)) {
+		if !ln.IsValid() {
 			return fmt.Errorf("%q is not a valid label name", ln)
 		}
 	}

vendor/github.com/prometheus/common/model/metric.go

@@ -21,8 +21,11 @@ import (
 )
 
 var (
-	separator    = []byte{0}
-	MetricNameRE = regexp.MustCompile(`^[a-zA-Z_][a-zA-Z0-9_:]*$`)
+	separator = []byte{0}
+	// MetricNameRE is a regular expression matching valid metric
+	// names. Note that the IsValidMetricName function performs the same
+	// check but faster than a match with this regular expression.
+	MetricNameRE = regexp.MustCompile(`^[a-zA-Z_:][a-zA-Z0-9_:]*$`)
 )
 
 // A Metric is similar to a LabelSet, but the key difference is that a Metric is
@@ -41,7 +44,7 @@ func (m Metric) Before(o Metric) bool {
 
 // Clone returns a copy of the Metric.
 func (m Metric) Clone() Metric {
-	clone := Metric{}
+	clone := make(Metric, len(m))
 	for k, v := range m {
 		clone[k] = v
 	}
@@ -85,6 +88,8 @@ func (m Metric) FastFingerprint() Fingerprint {
 }
 
 // IsValidMetricName returns true iff name matches the pattern of MetricNameRE.
+// This function, however, does not use MetricNameRE for the check but a much
+// faster hardcoded implementation.
 func IsValidMetricName(n LabelValue) bool {
 	if len(n) == 0 {
 		return false

vendor/github.com/prometheus/common/route/route.go

@@ -33,18 +33,19 @@ func WithParam(ctx context.Context, p, v string) context.Context {
 	return context.WithValue(ctx, param(p), v)
 }
 
-type contextFn func(r *http.Request) (context.Context, error)
+// ContextFunc returns a new context for a request.
+type ContextFunc func(r *http.Request) (context.Context, error)
 
 // Router wraps httprouter.Router and adds support for prefixed sub-routers
 // and per-request context injections.
 type Router struct {
 	rtr    *httprouter.Router
 	prefix string
-	ctxFn  contextFn
+	ctxFn  ContextFunc
 }
 
 // New returns a new Router.
-func New(ctxFn contextFn) *Router {
+func New(ctxFn ContextFunc) *Router {
 	if ctxFn == nil {
 		ctxFn = func(r *http.Request) (context.Context, error) {
 			return context.Background(), nil

vendor/vendor.json

@@ -516,40 +516,40 @@
 			"revisionTime": "2015-02-12T10:17:44Z"
 		},
 		{
-			"checksumSHA1": "mHyjbJ3BWOfUV6q9f5PBt0gaY1k=",
+			"checksumSHA1": "jG8qYuDUuaZeflt4JxBBdyQBsXw=",
 			"path": "github.com/prometheus/common/expfmt",
-			"revision": "85637ea67b04b5c3bb25e671dacded2977f8f9f6",
-			"revisionTime": "2016-10-02T21:02:34Z"
+			"revision": "dd2f054febf4a6c00f2343686efb775948a8bff4",
+			"revisionTime": "2017-01-08T23:12:12Z"
 		},
 		{
 			"checksumSHA1": "GWlM3d2vPYyNATtTFgftS10/A9w=",
 			"path": "github.com/prometheus/common/internal/bitbucket.org/ww/goautoneg",
-			"revision": "85637ea67b04b5c3bb25e671dacded2977f8f9f6",
-			"revisionTime": "2016-10-02T21:02:34Z"
+			"revision": "dd2f054febf4a6c00f2343686efb775948a8bff4",
+			"revisionTime": "2017-01-08T23:12:12Z"
 		},
 		{
-			"checksumSHA1": "UU6hIfhVjnAYDADQEfE/3T7Ddm8=",
+			"checksumSHA1": "ZA4MLHNAP905WiAOLy4BBzmcuxM=",
 			"path": "github.com/prometheus/common/log",
-			"revision": "85637ea67b04b5c3bb25e671dacded2977f8f9f6",
-			"revisionTime": "2016-10-02T21:02:34Z"
+			"revision": "dd2f054febf4a6c00f2343686efb775948a8bff4",
+			"revisionTime": "2017-01-08T23:12:12Z"
 		},
 		{
-			"checksumSHA1": "nFie+rxcX5WdIv1diZ+fu3aj6lE=",
+			"checksumSHA1": "vopCLXHzYm+3l5fPKOf4/fQwrCM=",
 			"path": "github.com/prometheus/common/model",
-			"revision": "85637ea67b04b5c3bb25e671dacded2977f8f9f6",
-			"revisionTime": "2016-10-02T21:02:34Z"
+			"revision": "dd2f054febf4a6c00f2343686efb775948a8bff4",
+			"revisionTime": "2017-01-08T23:12:12Z"
 		},
 		{
-			"checksumSHA1": "QQKJYoGcY10nIHxhBEHwjwUZQzk=",
+			"checksumSHA1": "ZbbESWBHHcPUJ/A5yrzKhTHuPc8=",
 			"path": "github.com/prometheus/common/route",
-			"revision": "85637ea67b04b5c3bb25e671dacded2977f8f9f6",
-			"revisionTime": "2016-10-02T21:02:34Z"
+			"revision": "dd2f054febf4a6c00f2343686efb775948a8bff4",
+			"revisionTime": "2017-01-08T23:12:12Z"
 		},
 		{
 			"checksumSHA1": "91KYK0SpvkaMJJA2+BcxbVnyRO0=",
 			"path": "github.com/prometheus/common/version",
-			"revision": "85637ea67b04b5c3bb25e671dacded2977f8f9f6",
-			"revisionTime": "2016-10-02T21:02:34Z"
+			"revision": "dd2f054febf4a6c00f2343686efb775948a8bff4",
+			"revisionTime": "2017-01-08T23:12:12Z"
 		},
 		{
 			"checksumSHA1": "W218eJZPXJG783fUr/z6IaAZyes=",

web/api/v1/api.go

@@ -69,7 +69,11 @@ func (e *apiError) Error() string {
 }
 
 type targetRetriever interface {
-	Targets() []retrieval.Target
+	Targets() []*retrieval.Target
+}
+
+type alertmanagerRetriever interface {
+	Alertmanagers() []string
 }
 
 type response struct {
@@ -94,20 +98,22 @@ type API struct {
 	Storage     storage.Storage
 	QueryEngine *promql.Engine
 
-	targetRetriever targetRetriever
+	targetRetriever       targetRetriever
+	alertmanagerRetriever alertmanagerRetriever
 
 	context func(r *http.Request) context.Context
 	now     func() time.Time
 }
 
 // NewAPI returns an initialized API type.
-func NewAPI(qe *promql.Engine, st storage.Storage, tr targetRetriever) *API {
+func NewAPI(qe *promql.Engine, st storage.Storage, tr targetRetriever, ar alertmanagerRetriever) *API {
 	return &API{
-		QueryEngine:     qe,
-		Storage:         st,
-		targetRetriever: tr,
-		context:         route.Context,
-		now:             time.Now,
+		QueryEngine:           qe,
+		Storage:               st,
+		targetRetriever:       tr,
+		alertmanagerRetriever: ar,
+		context:               route.Context,
+		now:                   time.Now,
 	}
 }
 
@@ -140,6 +146,7 @@ func (api *API) Register(r *route.Router) {
 	r.Del("/series", instr("drop_series", api.dropSeries))
 
 	r.Get("/targets", instr("targets", api.targets))
+	r.Get("/alertmanagers", instr("alertmanagers", api.alertmanagers))
 }
 
 type queryData struct {
@@ -360,16 +367,20 @@ type Target struct {
 	// Any labels that are added to this target and its metrics.
 	Labels map[string]string `json:"labels"`
 
-	ScrapeUrl string `json:"scrapeUrl"`
+	ScrapeURL string `json:"scrapeUrl"`
 
 	LastError  string                 `json:"lastError"`
 	LastScrape time.Time              `json:"lastScrape"`
 	Health     retrieval.TargetHealth `json:"health"`
 }
 
+type TargetDiscovery struct {
+	ActiveTargets []*Target `json:"activeTargets"`
+}
+
 func (api *API) targets(r *http.Request) (interface{}, *apiError) {
 	targets := api.targetRetriever.Targets()
-	res := make([]*Target, len(targets))
+	res := &TargetDiscovery{ActiveTargets: make([]*Target, len(targets))}
 
 	for i, t := range targets {
 		lastErrStr := ""
@@ -378,10 +389,10 @@ func (api *API) targets(r *http.Request) (interface{}, *apiError) {
 			lastErrStr = lastErr.Error()
 		}
 
-		res[i] = &Target{
+		res.ActiveTargets[i] = &Target{
 			DiscoveredLabels: t.DiscoveredLabels().Map(),
 			Labels:           t.Labels().Map(),
-			ScrapeUrl:        t.URL().String(),
+			ScrapeURL:        t.URL().String(),
 			LastError:        lastErrStr,
 			LastScrape:       t.LastScrape(),
 			Health:           t.Health(),
@@ -391,6 +402,25 @@ func (api *API) targets(r *http.Request) (interface{}, *apiError) {
 	return res, nil
 }
 
+type AlertmanagerDiscovery struct {
+	ActiveAlertmanagers []*AlertmanagerTarget `json:"activeAlertmanagers"`
+}
+
+type AlertmanagerTarget struct {
+	URL string `json:"url"`
+}
+
+func (api *API) alertmanagers(r *http.Request) (interface{}, *apiError) {
+	urls := api.alertmanagerRetriever.Alertmanagers()
+	ams := &AlertmanagerDiscovery{ActiveAlertmanagers: make([]*AlertmanagerTarget, len(urls))}
+
+	for i := range urls {
+		ams.ActiveAlertmanagers[i] = &AlertmanagerTarget{URL: urls[i]}
+	}
+
+	return ams, nil
+}
+
 func respond(w http.ResponseWriter, data interface{}) {
 	w.Header().Set("Content-Type", "application/json")
 	w.WriteHeader(http.StatusOK)

web/api/v1/api_test.go

@@ -35,9 +35,15 @@ import (
 	"github.com/prometheus/prometheus/retrieval"
 )
 
-type targetRetrieverFunc func() []retrieval.Target
+type targetRetrieverFunc func() []*retrieval.Target
 
-func (f targetRetrieverFunc) Targets() []retrieval.Target {
+func (f targetRetrieverFunc) Targets() []*retrieval.Target {
+	return f()
+}
+
+type alertmanagerRetrieverFunc func() []string
+
+func (f alertmanagerRetrieverFunc) Alertmanagers() []string {
 	return f()
 }
 
@@ -59,9 +65,9 @@ func TestEndpoints(t *testing.T) {
 
 	now := time.Now()
 
-	tr := targetRetrieverFunc(func() []retrieval.Target {
-		return []retrieval.Target{
-			*retrieval.NewTarget(
+	tr := targetRetrieverFunc(func() []*retrieval.Target {
+		return []*retrieval.Target{
+			retrieval.NewTarget(
 				labels.FromMap(map[string]string{
 					model.SchemeLabel:      "http",
 					model.AddressLabel:     "example.com:8080",
@@ -73,11 +79,16 @@ func TestEndpoints(t *testing.T) {
 		}
 	})
 
+	ar := alertmanagerRetrieverFunc(func() []string {
+		return []string{"http://alertmanager.example.com:8080/api/v1/alerts"}
+	})
+
 	api := &API{
-		Storage:         suite.Storage(),
-		QueryEngine:     suite.QueryEngine(),
-		targetRetriever: tr,
-		now:             func() time.Time { return now },
+		Storage:               suite.Storage(),
+		QueryEngine:           suite.QueryEngine(),
+		targetRetriever:       tr,
+		alertmanagerRetriever: ar,
+		now: func() time.Time { return now },
 	}
 
 	start := time.Unix(0, 0)

web/ui/templates/_base.html

@@ -3,6 +3,7 @@
   <head>
     <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
     <title>Prometheus Time Series Collection and Processing Server</title>
+    <link rel="shortcut icon" href="{{ pathPrefix }}/static/img/favicon.ico">
     <script src="{{ pathPrefix }}/static/vendor/js/jquery.min.js"></script>
     <script src="{{ pathPrefix }}/static/vendor/bootstrap-3.3.1/js/bootstrap.min.js"></script>
 

web/web.go

@@ -155,7 +155,7 @@ func New(o *Options) *Handler {
 		storage:       o.Storage,
 		notifier:      o.Notifier,
 
-		apiV1: api_v1.NewAPI(o.QueryEngine, o.Storage, o.TargetManager),
+		apiV1: api_v1.NewAPI(o.QueryEngine, o.Storage, o.TargetManager, o.Notifier),
 		now:   model.Now,
 	}
 
@@ -274,7 +274,7 @@ func (h *Handler) Run() {
 
 func (h *Handler) alerts(w http.ResponseWriter, r *http.Request) {
 	alerts := h.ruleManager.AlertingRules()
-	alertsSorter := byAlertStateSorter{alerts: alerts}
+	alertsSorter := byAlertStateAndNameSorter{alerts: alerts}
 	sort.Sort(alertsSorter)
 
 	alertStatus := AlertStatus{
@@ -373,14 +373,14 @@ func (h *Handler) rules(w http.ResponseWriter, r *http.Request) {
 
 func (h *Handler) targets(w http.ResponseWriter, r *http.Request) {
 	// Bucket targets by job label
-	tps := map[string][]retrieval.Target{}
+	tps := map[string][]*retrieval.Target{}
 	for _, t := range h.targetManager.Targets() {
 		job := t.Labels().Get(model.JobLabel)
 		tps[job] = append(tps[job], t)
 	}
 
 	h.executeTemplate(w, "targets.html", struct {
-		TargetPools map[string][]retrieval.Target
+		TargetPools map[string][]*retrieval.Target
 	}{
 		TargetPools: tps,
 	})
@@ -541,18 +541,20 @@ type AlertStatus struct {
 	AlertStateToRowClass map[rules.AlertState]string
 }
 
-type byAlertStateSorter struct {
+type byAlertStateAndNameSorter struct {
 	alerts []*rules.AlertingRule
 }
 
-func (s byAlertStateSorter) Len() int {
+func (s byAlertStateAndNameSorter) Len() int {
 	return len(s.alerts)
 }
 
-func (s byAlertStateSorter) Less(i, j int) bool {
-	return s.alerts[i].State() > s.alerts[j].State()
+func (s byAlertStateAndNameSorter) Less(i, j int) bool {
+	return s.alerts[i].State() > s.alerts[j].State() ||
+		(s.alerts[i].State() == s.alerts[j].State() &&
+			s.alerts[i].Name() < s.alerts[j].Name())
 }
 
-func (s byAlertStateSorter) Swap(i, j int) {
+func (s byAlertStateAndNameSorter) Swap(i, j int) {
 	s.alerts[i], s.alerts[j] = s.alerts[j], s.alerts[i]
 }