Add limits to global config (#12126)

* Add limits to global config

Signed-off-by: Arianna Vespri <arianna.vespri@yahoo.it>

* Move changes into Validate func

Signed-off-by: Arianna Vespri <arianna.vespri@yahoo.it>

* Make comments consistent wrt 0 meaning no limit

Signed-off-by: Arianna Vespri <arianna.vespri@yahoo.it>

* Document global limits

Signed-off-by: Arianna Vespri <arianna.vespri@yahoo.it>

---------

Signed-off-by: Arianna Vespri <arianna.vespri@yahoo.it>

config/config.go

@@ -267,7 +267,7 @@ func (c *Config) GetScrapeConfigs() ([]*ScrapeConfig, error) {
 	for i, scfg := range c.ScrapeConfigs {
 		// We do these checks for library users that would not call Validate in
 		// Unmarshal.
-		if err := scfg.Validate(c.GlobalConfig.ScrapeInterval, c.GlobalConfig.ScrapeTimeout); err != nil {
+		if err := scfg.Validate(c.GlobalConfig); err != nil {
 			return nil, err
 		}
 
@@ -294,7 +294,7 @@ func (c *Config) GetScrapeConfigs() ([]*ScrapeConfig, error) {
 				return nil, fileErr(filename, err)
 			}
 			for _, scfg := range cfg.ScrapeConfigs {
-				if err := scfg.Validate(c.GlobalConfig.ScrapeInterval, c.GlobalConfig.ScrapeTimeout); err != nil {
+				if err := scfg.Validate(c.GlobalConfig); err != nil {
 					return nil, fileErr(filename, err)
 				}
 
@@ -343,7 +343,7 @@ func (c *Config) UnmarshalYAML(unmarshal func(interface{}) error) error {
 	// Do global overrides and validate unique names.
 	jobNames := map[string]struct{}{}
 	for _, scfg := range c.ScrapeConfigs {
-		if err := scfg.Validate(c.GlobalConfig.ScrapeInterval, c.GlobalConfig.ScrapeTimeout); err != nil {
+		if err := scfg.Validate(c.GlobalConfig); err != nil {
 			return err
 		}
 
@@ -390,6 +390,24 @@ type GlobalConfig struct {
 	QueryLogFile string `yaml:"query_log_file,omitempty"`
 	// The labels to add to any timeseries that this Prometheus instance scrapes.
 	ExternalLabels labels.Labels `yaml:"external_labels,omitempty"`
+	// An uncompressed response body larger than this many bytes will cause the
+	// scrape to fail. 0 means no limit.
+	BodySizeLimit units.Base2Bytes `yaml:"body_size_limit,omitempty"`
+	// More than this many samples post metric-relabeling will cause the scrape to
+	// fail. 0 means no limit.
+	SampleLimit uint `yaml:"sample_limit,omitempty"`
+	// More than this many targets after the target relabeling will cause the
+	// scrapes to fail. 0 means no limit.
+	TargetLimit uint `yaml:"target_limit,omitempty"`
+	// More than this many labels post metric-relabeling will cause the scrape to
+	// fail. 0 means no limit.
+	LabelLimit uint `yaml:"label_limit,omitempty"`
+	// More than this label name length post metric-relabeling will cause the
+	// scrape to fail. 0 means no limit.
+	LabelNameLengthLimit uint `yaml:"label_name_length_limit,omitempty"`
+	// More than this label value length post metric-relabeling will cause the
+	// scrape to fail. 0 means no limit.
+	LabelValueLengthLimit uint `yaml:"label_value_length_limit,omitempty"`
 }
 
 // SetDirectory joins any relative file paths with dir.
@@ -478,19 +496,19 @@ type ScrapeConfig struct {
 	// scrape to fail. 0 means no limit.
 	BodySizeLimit units.Base2Bytes `yaml:"body_size_limit,omitempty"`
 	// More than this many samples post metric-relabeling will cause the scrape to
-	// fail.
+	// fail. 0 means no limit.
 	SampleLimit uint `yaml:"sample_limit,omitempty"`
 	// More than this many targets after the target relabeling will cause the
-	// scrapes to fail.
+	// scrapes to fail. 0 means no limit.
 	TargetLimit uint `yaml:"target_limit,omitempty"`
 	// More than this many labels post metric-relabeling will cause the scrape to
-	// fail.
+	// fail. 0 means no limit.
 	LabelLimit uint `yaml:"label_limit,omitempty"`
 	// More than this label name length post metric-relabeling will cause the
-	// scrape to fail.
+	// scrape to fail. 0 means no limit.
 	LabelNameLengthLimit uint `yaml:"label_name_length_limit,omitempty"`
 	// More than this label value length post metric-relabeling will cause the
-	// scrape to fail.
+	// scrape to fail. 0 means no limit.
 	LabelValueLengthLimit uint `yaml:"label_value_length_limit,omitempty"`
 	// More than this many buckets in a native histogram will cause the scrape to
 	// fail.
@@ -552,25 +570,44 @@ func (c *ScrapeConfig) UnmarshalYAML(unmarshal func(interface{}) error) error {
 	return nil
 }
 
-func (c *ScrapeConfig) Validate(defaultInterval, defaultTimeout model.Duration) error {
+func (c *ScrapeConfig) Validate(globalConfig GlobalConfig) error {
 	if c == nil {
 		return errors.New("empty or null scrape config section")
 	}
 	// First set the correct scrape interval, then check that the timeout
 	// (inferred or explicit) is not greater than that.
 	if c.ScrapeInterval == 0 {
-		c.ScrapeInterval = defaultInterval
+		c.ScrapeInterval = globalConfig.ScrapeInterval
 	}
 	if c.ScrapeTimeout > c.ScrapeInterval {
 		return fmt.Errorf("scrape timeout greater than scrape interval for scrape config with job name %q", c.JobName)
 	}
 	if c.ScrapeTimeout == 0 {
-		if defaultTimeout > c.ScrapeInterval {
+		if globalConfig.ScrapeTimeout > c.ScrapeInterval {
 			c.ScrapeTimeout = c.ScrapeInterval
 		} else {
-			c.ScrapeTimeout = defaultTimeout
+			c.ScrapeTimeout = globalConfig.ScrapeTimeout
+		}
 	}
+	if c.BodySizeLimit == 0 {
+		c.BodySizeLimit = globalConfig.BodySizeLimit
 	}
+	if c.SampleLimit == 0 {
+		c.SampleLimit = globalConfig.SampleLimit
+	}
+	if c.TargetLimit == 0 {
+		c.TargetLimit = globalConfig.TargetLimit
+	}
+	if c.LabelLimit == 0 {
+		c.LabelLimit = globalConfig.LabelLimit
+	}
+	if c.LabelNameLengthLimit == 0 {
+		c.LabelNameLengthLimit = globalConfig.LabelNameLengthLimit
+	}
+	if c.LabelValueLengthLimit == 0 {
+		c.LabelValueLengthLimit = globalConfig.LabelValueLengthLimit
+	}
+
 	return nil
 }
 

config/config_test.go

@@ -68,6 +68,15 @@ func mustParseURL(u string) *config.URL {
 	return &config.URL{URL: parsed}
 }
 
+const (
+	globBodySizeLimit         = 15 * units.MiB
+	globSampleLimit           = 1500
+	globTargetLimit           = 30
+	globLabelLimit            = 30
+	globLabelNameLengthLimit  = 200
+	globLabelValueLengthLimit = 200
+)
+
 var expectedConf = &Config{
 	GlobalConfig: GlobalConfig{
 		ScrapeInterval:     model.Duration(15 * time.Second),
@@ -76,6 +85,13 @@ var expectedConf = &Config{
 		QueryLogFile:       "",
 
 		ExternalLabels: labels.FromStrings("foo", "bar", "monitor", "codelab"),
+
+		BodySizeLimit:         globBodySizeLimit,
+		SampleLimit:           globSampleLimit,
+		TargetLimit:           globTargetLimit,
+		LabelLimit:            globLabelLimit,
+		LabelNameLengthLimit:  globLabelNameLengthLimit,
+		LabelValueLengthLimit: globLabelValueLengthLimit,
 	},
 
 	RuleFiles: []string{
@@ -169,6 +185,12 @@ var expectedConf = &Config{
 			HonorTimestamps:       true,
 			ScrapeInterval:        model.Duration(15 * time.Second),
 			ScrapeTimeout:         DefaultGlobalConfig.ScrapeTimeout,
+			BodySizeLimit:         globBodySizeLimit,
+			SampleLimit:           globSampleLimit,
+			TargetLimit:           globTargetLimit,
+			LabelLimit:            globLabelLimit,
+			LabelNameLengthLimit:  globLabelNameLengthLimit,
+			LabelValueLengthLimit: globLabelValueLengthLimit,
 
 			MetricsPath: DefaultScrapeConfig.MetricsPath,
 			Scheme:      DefaultScrapeConfig.Scheme,
@@ -266,6 +288,10 @@ var expectedConf = &Config{
 			ScrapeTimeout:         model.Duration(5 * time.Second),
 			BodySizeLimit:         10 * units.MiB,
 			SampleLimit:           1000,
+			TargetLimit:           35,
+			LabelLimit:            35,
+			LabelNameLengthLimit:  210,
+			LabelValueLengthLimit: 210,
 
 			HTTPClientConfig: config.HTTPClientConfig{
 				BasicAuth: &config.BasicAuth{
@@ -355,6 +381,12 @@ var expectedConf = &Config{
 			HonorTimestamps:       true,
 			ScrapeInterval:        model.Duration(15 * time.Second),
 			ScrapeTimeout:         DefaultGlobalConfig.ScrapeTimeout,
+			BodySizeLimit:         globBodySizeLimit,
+			SampleLimit:           globSampleLimit,
+			TargetLimit:           globTargetLimit,
+			LabelLimit:            globLabelLimit,
+			LabelNameLengthLimit:  globLabelNameLengthLimit,
+			LabelValueLengthLimit: globLabelValueLengthLimit,
 
 			MetricsPath:      DefaultScrapeConfig.MetricsPath,
 			Scheme:           DefaultScrapeConfig.Scheme,
@@ -402,6 +434,12 @@ var expectedConf = &Config{
 			HonorTimestamps:       true,
 			ScrapeInterval:        model.Duration(15 * time.Second),
 			ScrapeTimeout:         model.Duration(10 * time.Second),
+			BodySizeLimit:         globBodySizeLimit,
+			SampleLimit:           globSampleLimit,
+			TargetLimit:           globTargetLimit,
+			LabelLimit:            globLabelLimit,
+			LabelNameLengthLimit:  globLabelNameLengthLimit,
+			LabelValueLengthLimit: globLabelValueLengthLimit,
 
 			MetricsPath: "/metrics",
 			Scheme:      "http",
@@ -427,6 +465,12 @@ var expectedConf = &Config{
 			HonorTimestamps:       true,
 			ScrapeInterval:        model.Duration(15 * time.Second),
 			ScrapeTimeout:         DefaultGlobalConfig.ScrapeTimeout,
+			BodySizeLimit:         globBodySizeLimit,
+			SampleLimit:           globSampleLimit,
+			TargetLimit:           globTargetLimit,
+			LabelLimit:            globLabelLimit,
+			LabelNameLengthLimit:  globLabelNameLengthLimit,
+			LabelValueLengthLimit: globLabelValueLengthLimit,
 
 			MetricsPath:      DefaultScrapeConfig.MetricsPath,
 			Scheme:           DefaultScrapeConfig.Scheme,
@@ -458,6 +502,12 @@ var expectedConf = &Config{
 			HonorTimestamps:       true,
 			ScrapeInterval:        model.Duration(15 * time.Second),
 			ScrapeTimeout:         DefaultGlobalConfig.ScrapeTimeout,
+			BodySizeLimit:         globBodySizeLimit,
+			SampleLimit:           globSampleLimit,
+			TargetLimit:           globTargetLimit,
+			LabelLimit:            globLabelLimit,
+			LabelNameLengthLimit:  globLabelNameLengthLimit,
+			LabelValueLengthLimit: globLabelValueLengthLimit,
 
 			MetricsPath: DefaultScrapeConfig.MetricsPath,
 			Scheme:      DefaultScrapeConfig.Scheme,
@@ -489,6 +539,12 @@ var expectedConf = &Config{
 			HonorTimestamps:       true,
 			ScrapeInterval:        model.Duration(15 * time.Second),
 			ScrapeTimeout:         DefaultGlobalConfig.ScrapeTimeout,
+			BodySizeLimit:         globBodySizeLimit,
+			SampleLimit:           globSampleLimit,
+			TargetLimit:           globTargetLimit,
+			LabelLimit:            globLabelLimit,
+			LabelNameLengthLimit:  globLabelNameLengthLimit,
+			LabelValueLengthLimit: globLabelValueLengthLimit,
 
 			MetricsPath:      DefaultScrapeConfig.MetricsPath,
 			Scheme:           DefaultScrapeConfig.Scheme,
@@ -509,6 +565,12 @@ var expectedConf = &Config{
 			HonorTimestamps:       true,
 			ScrapeInterval:        model.Duration(15 * time.Second),
 			ScrapeTimeout:         DefaultGlobalConfig.ScrapeTimeout,
+			BodySizeLimit:         globBodySizeLimit,
+			SampleLimit:           globSampleLimit,
+			TargetLimit:           globTargetLimit,
+			LabelLimit:            globLabelLimit,
+			LabelNameLengthLimit:  globLabelNameLengthLimit,
+			LabelValueLengthLimit: globLabelValueLengthLimit,
 
 			MetricsPath:      DefaultScrapeConfig.MetricsPath,
 			Scheme:           DefaultScrapeConfig.Scheme,
@@ -538,6 +600,12 @@ var expectedConf = &Config{
 			HonorTimestamps:       true,
 			ScrapeInterval:        model.Duration(15 * time.Second),
 			ScrapeTimeout:         DefaultGlobalConfig.ScrapeTimeout,
+			BodySizeLimit:         globBodySizeLimit,
+			SampleLimit:           globSampleLimit,
+			TargetLimit:           globTargetLimit,
+			LabelLimit:            globLabelLimit,
+			LabelNameLengthLimit:  globLabelNameLengthLimit,
+			LabelValueLengthLimit: globLabelValueLengthLimit,
 
 			MetricsPath:      DefaultScrapeConfig.MetricsPath,
 			Scheme:           DefaultScrapeConfig.Scheme,
@@ -564,6 +632,12 @@ var expectedConf = &Config{
 			HonorTimestamps:       true,
 			ScrapeInterval:        model.Duration(15 * time.Second),
 			ScrapeTimeout:         DefaultGlobalConfig.ScrapeTimeout,
+			BodySizeLimit:         globBodySizeLimit,
+			SampleLimit:           globSampleLimit,
+			TargetLimit:           globTargetLimit,
+			LabelLimit:            globLabelLimit,
+			LabelNameLengthLimit:  globLabelNameLengthLimit,
+			LabelValueLengthLimit: globLabelValueLengthLimit,
 
 			MetricsPath:      DefaultScrapeConfig.MetricsPath,
 			Scheme:           DefaultScrapeConfig.Scheme,
@@ -597,6 +671,12 @@ var expectedConf = &Config{
 			HonorTimestamps:       true,
 			ScrapeInterval:        model.Duration(15 * time.Second),
 			ScrapeTimeout:         DefaultGlobalConfig.ScrapeTimeout,
+			BodySizeLimit:         globBodySizeLimit,
+			SampleLimit:           globSampleLimit,
+			TargetLimit:           globTargetLimit,
+			LabelLimit:            globLabelLimit,
+			LabelNameLengthLimit:  globLabelNameLengthLimit,
+			LabelValueLengthLimit: globLabelValueLengthLimit,
 
 			MetricsPath:      DefaultScrapeConfig.MetricsPath,
 			Scheme:           DefaultScrapeConfig.Scheme,
@@ -620,6 +700,12 @@ var expectedConf = &Config{
 			HonorTimestamps:       true,
 			ScrapeInterval:        model.Duration(15 * time.Second),
 			ScrapeTimeout:         DefaultGlobalConfig.ScrapeTimeout,
+			BodySizeLimit:         globBodySizeLimit,
+			SampleLimit:           globSampleLimit,
+			TargetLimit:           globTargetLimit,
+			LabelLimit:            globLabelLimit,
+			LabelNameLengthLimit:  globLabelNameLengthLimit,
+			LabelValueLengthLimit: globLabelValueLengthLimit,
 
 			MetricsPath:      DefaultScrapeConfig.MetricsPath,
 			Scheme:           DefaultScrapeConfig.Scheme,
@@ -646,6 +732,12 @@ var expectedConf = &Config{
 			HonorTimestamps:       true,
 			ScrapeInterval:        model.Duration(15 * time.Second),
 			ScrapeTimeout:         DefaultGlobalConfig.ScrapeTimeout,
+			BodySizeLimit:         globBodySizeLimit,
+			SampleLimit:           globSampleLimit,
+			TargetLimit:           globTargetLimit,
+			LabelLimit:            globLabelLimit,
+			LabelNameLengthLimit:  globLabelNameLengthLimit,
+			LabelValueLengthLimit: globLabelValueLengthLimit,
 
 			MetricsPath:      DefaultScrapeConfig.MetricsPath,
 			Scheme:           DefaultScrapeConfig.Scheme,
@@ -665,6 +757,12 @@ var expectedConf = &Config{
 			HonorTimestamps:       true,
 			ScrapeInterval:        model.Duration(15 * time.Second),
 			ScrapeTimeout:         DefaultGlobalConfig.ScrapeTimeout,
+			BodySizeLimit:         globBodySizeLimit,
+			SampleLimit:           globSampleLimit,
+			TargetLimit:           globTargetLimit,
+			LabelLimit:            globLabelLimit,
+			LabelNameLengthLimit:  globLabelNameLengthLimit,
+			LabelValueLengthLimit: globLabelValueLengthLimit,
 
 			MetricsPath:      DefaultScrapeConfig.MetricsPath,
 			Scheme:           DefaultScrapeConfig.Scheme,
@@ -687,6 +785,12 @@ var expectedConf = &Config{
 			HonorTimestamps:       false,
 			ScrapeInterval:        model.Duration(15 * time.Second),
 			ScrapeTimeout:         DefaultGlobalConfig.ScrapeTimeout,
+			BodySizeLimit:         globBodySizeLimit,
+			SampleLimit:           globSampleLimit,
+			TargetLimit:           globTargetLimit,
+			LabelLimit:            globLabelLimit,
+			LabelNameLengthLimit:  globLabelNameLengthLimit,
+			LabelValueLengthLimit: globLabelValueLengthLimit,
 
 			MetricsPath:      "/federate",
 			Scheme:           DefaultScrapeConfig.Scheme,
@@ -709,6 +813,12 @@ var expectedConf = &Config{
 			HonorTimestamps:       true,
 			ScrapeInterval:        model.Duration(15 * time.Second),
 			ScrapeTimeout:         DefaultGlobalConfig.ScrapeTimeout,
+			BodySizeLimit:         globBodySizeLimit,
+			SampleLimit:           globSampleLimit,
+			TargetLimit:           globTargetLimit,
+			LabelLimit:            globLabelLimit,
+			LabelNameLengthLimit:  globLabelNameLengthLimit,
+			LabelValueLengthLimit: globLabelValueLengthLimit,
 
 			MetricsPath:      DefaultScrapeConfig.MetricsPath,
 			Scheme:           DefaultScrapeConfig.Scheme,
@@ -731,6 +841,12 @@ var expectedConf = &Config{
 			HonorTimestamps:       true,
 			ScrapeInterval:        model.Duration(15 * time.Second),
 			ScrapeTimeout:         DefaultGlobalConfig.ScrapeTimeout,
+			BodySizeLimit:         globBodySizeLimit,
+			SampleLimit:           globSampleLimit,
+			TargetLimit:           globTargetLimit,
+			LabelLimit:            globLabelLimit,
+			LabelNameLengthLimit:  globLabelNameLengthLimit,
+			LabelValueLengthLimit: globLabelValueLengthLimit,
 
 			MetricsPath:      DefaultScrapeConfig.MetricsPath,
 			Scheme:           DefaultScrapeConfig.Scheme,
@@ -750,6 +866,12 @@ var expectedConf = &Config{
 			HonorTimestamps:       true,
 			ScrapeInterval:        model.Duration(15 * time.Second),
 			ScrapeTimeout:         DefaultGlobalConfig.ScrapeTimeout,
+			BodySizeLimit:         globBodySizeLimit,
+			SampleLimit:           globSampleLimit,
+			TargetLimit:           globTargetLimit,
+			LabelLimit:            globLabelLimit,
+			LabelNameLengthLimit:  globLabelNameLengthLimit,
+			LabelValueLengthLimit: globLabelValueLengthLimit,
 
 			MetricsPath:      DefaultScrapeConfig.MetricsPath,
 			Scheme:           DefaultScrapeConfig.Scheme,
@@ -777,6 +899,12 @@ var expectedConf = &Config{
 			HonorTimestamps:       true,
 			ScrapeInterval:        model.Duration(15 * time.Second),
 			ScrapeTimeout:         DefaultGlobalConfig.ScrapeTimeout,
+			BodySizeLimit:         globBodySizeLimit,
+			SampleLimit:           globSampleLimit,
+			TargetLimit:           globTargetLimit,
+			LabelLimit:            globLabelLimit,
+			LabelNameLengthLimit:  globLabelNameLengthLimit,
+			LabelValueLengthLimit: globLabelValueLengthLimit,
 
 			MetricsPath:      DefaultScrapeConfig.MetricsPath,
 			Scheme:           DefaultScrapeConfig.Scheme,
@@ -803,6 +931,12 @@ var expectedConf = &Config{
 			HonorTimestamps:       true,
 			ScrapeInterval:        model.Duration(15 * time.Second),
 			ScrapeTimeout:         DefaultGlobalConfig.ScrapeTimeout,
+			BodySizeLimit:         globBodySizeLimit,
+			SampleLimit:           globSampleLimit,
+			TargetLimit:           globTargetLimit,
+			LabelLimit:            globLabelLimit,
+			LabelNameLengthLimit:  globLabelNameLengthLimit,
+			LabelValueLengthLimit: globLabelValueLengthLimit,
 
 			MetricsPath:      DefaultScrapeConfig.MetricsPath,
 			Scheme:           DefaultScrapeConfig.Scheme,
@@ -825,6 +959,12 @@ var expectedConf = &Config{
 			HonorTimestamps:       true,
 			ScrapeInterval:        model.Duration(15 * time.Second),
 			ScrapeTimeout:         DefaultGlobalConfig.ScrapeTimeout,
+			BodySizeLimit:         globBodySizeLimit,
+			SampleLimit:           globSampleLimit,
+			TargetLimit:           globTargetLimit,
+			LabelLimit:            globLabelLimit,
+			LabelNameLengthLimit:  globLabelNameLengthLimit,
+			LabelValueLengthLimit: globLabelValueLengthLimit,
 
 			MetricsPath:      DefaultScrapeConfig.MetricsPath,
 			Scheme:           DefaultScrapeConfig.Scheme,
@@ -847,6 +987,12 @@ var expectedConf = &Config{
 			HonorTimestamps:       true,
 			ScrapeInterval:        model.Duration(15 * time.Second),
 			ScrapeTimeout:         DefaultGlobalConfig.ScrapeTimeout,
+			BodySizeLimit:         globBodySizeLimit,
+			SampleLimit:           globSampleLimit,
+			TargetLimit:           globTargetLimit,
+			LabelLimit:            globLabelLimit,
+			LabelNameLengthLimit:  globLabelNameLengthLimit,
+			LabelValueLengthLimit: globLabelValueLengthLimit,
 
 			MetricsPath:      DefaultScrapeConfig.MetricsPath,
 			Scheme:           DefaultScrapeConfig.Scheme,
@@ -873,6 +1019,12 @@ var expectedConf = &Config{
 			HonorTimestamps:       true,
 			ScrapeInterval:        model.Duration(15 * time.Second),
 			ScrapeTimeout:         DefaultGlobalConfig.ScrapeTimeout,
+			BodySizeLimit:         globBodySizeLimit,
+			SampleLimit:           globSampleLimit,
+			TargetLimit:           globTargetLimit,
+			LabelLimit:            globLabelLimit,
+			LabelNameLengthLimit:  globLabelNameLengthLimit,
+			LabelValueLengthLimit: globLabelValueLengthLimit,
 
 			MetricsPath:      DefaultScrapeConfig.MetricsPath,
 			Scheme:           DefaultScrapeConfig.Scheme,
@@ -902,6 +1054,12 @@ var expectedConf = &Config{
 			HonorTimestamps:       true,
 			ScrapeInterval:        model.Duration(15 * time.Second),
 			ScrapeTimeout:         DefaultGlobalConfig.ScrapeTimeout,
+			BodySizeLimit:         globBodySizeLimit,
+			SampleLimit:           globSampleLimit,
+			TargetLimit:           globTargetLimit,
+			LabelLimit:            globLabelLimit,
+			LabelNameLengthLimit:  globLabelNameLengthLimit,
+			LabelValueLengthLimit: globLabelValueLengthLimit,
 
 			MetricsPath:      DefaultScrapeConfig.MetricsPath,
 			Scheme:           DefaultScrapeConfig.Scheme,
@@ -950,6 +1108,12 @@ var expectedConf = &Config{
 			HonorTimestamps:       true,
 			ScrapeInterval:        model.Duration(15 * time.Second),
 			ScrapeTimeout:         DefaultGlobalConfig.ScrapeTimeout,
+			BodySizeLimit:         globBodySizeLimit,
+			SampleLimit:           globSampleLimit,
+			TargetLimit:           globTargetLimit,
+			LabelLimit:            globLabelLimit,
+			LabelNameLengthLimit:  globLabelNameLengthLimit,
+			LabelValueLengthLimit: globLabelValueLengthLimit,
 
 			MetricsPath:      DefaultScrapeConfig.MetricsPath,
 			Scheme:           DefaultScrapeConfig.Scheme,
@@ -969,6 +1133,13 @@ var expectedConf = &Config{
 			HonorTimestamps:       true,
 			ScrapeInterval:        model.Duration(15 * time.Second),
 			ScrapeTimeout:         DefaultGlobalConfig.ScrapeTimeout,
+			BodySizeLimit:         globBodySizeLimit,
+			SampleLimit:           globSampleLimit,
+			TargetLimit:           globTargetLimit,
+			LabelLimit:            globLabelLimit,
+			LabelNameLengthLimit:  globLabelNameLengthLimit,
+			LabelValueLengthLimit: globLabelValueLengthLimit,
+
 			HTTPClientConfig: config.DefaultHTTPClientConfig,
 			MetricsPath:      DefaultScrapeConfig.MetricsPath,
 			Scheme:           DefaultScrapeConfig.Scheme,
@@ -998,6 +1169,13 @@ var expectedConf = &Config{
 			HonorTimestamps:       true,
 			ScrapeInterval:        model.Duration(15 * time.Second),
 			ScrapeTimeout:         DefaultGlobalConfig.ScrapeTimeout,
+			BodySizeLimit:         globBodySizeLimit,
+			SampleLimit:           globSampleLimit,
+			TargetLimit:           globTargetLimit,
+			LabelLimit:            globLabelLimit,
+			LabelNameLengthLimit:  globLabelNameLengthLimit,
+			LabelValueLengthLimit: globLabelValueLengthLimit,
+
 			HTTPClientConfig: config.DefaultHTTPClientConfig,
 			MetricsPath:      DefaultScrapeConfig.MetricsPath,
 			Scheme:           DefaultScrapeConfig.Scheme,
@@ -1033,6 +1211,12 @@ var expectedConf = &Config{
 			HonorTimestamps:       true,
 			ScrapeInterval:        model.Duration(15 * time.Second),
 			ScrapeTimeout:         DefaultGlobalConfig.ScrapeTimeout,
+			BodySizeLimit:         globBodySizeLimit,
+			SampleLimit:           globSampleLimit,
+			TargetLimit:           globTargetLimit,
+			LabelLimit:            globLabelLimit,
+			LabelNameLengthLimit:  globLabelNameLengthLimit,
+			LabelValueLengthLimit: globLabelValueLengthLimit,
 
 			MetricsPath:      DefaultScrapeConfig.MetricsPath,
 			Scheme:           DefaultScrapeConfig.Scheme,
@@ -1060,6 +1244,13 @@ var expectedConf = &Config{
 			HonorTimestamps:       true,
 			ScrapeInterval:        model.Duration(15 * time.Second),
 			ScrapeTimeout:         DefaultGlobalConfig.ScrapeTimeout,
+			BodySizeLimit:         globBodySizeLimit,
+			SampleLimit:           globSampleLimit,
+			TargetLimit:           globTargetLimit,
+			LabelLimit:            globLabelLimit,
+			LabelNameLengthLimit:  globLabelNameLengthLimit,
+			LabelValueLengthLimit: globLabelValueLengthLimit,
+
 			HTTPClientConfig: config.DefaultHTTPClientConfig,
 			MetricsPath:      DefaultScrapeConfig.MetricsPath,
 			Scheme:           DefaultScrapeConfig.Scheme,
@@ -1080,6 +1271,12 @@ var expectedConf = &Config{
 			HonorTimestamps:       true,
 			ScrapeInterval:        model.Duration(15 * time.Second),
 			ScrapeTimeout:         DefaultGlobalConfig.ScrapeTimeout,
+			BodySizeLimit:         globBodySizeLimit,
+			SampleLimit:           globSampleLimit,
+			TargetLimit:           globTargetLimit,
+			LabelLimit:            globLabelLimit,
+			LabelNameLengthLimit:  globLabelNameLengthLimit,
+			LabelValueLengthLimit: globLabelValueLengthLimit,
 
 			MetricsPath:      DefaultScrapeConfig.MetricsPath,
 			Scheme:           DefaultScrapeConfig.Scheme,
@@ -1104,6 +1301,12 @@ var expectedConf = &Config{
 			HonorTimestamps:       true,
 			ScrapeInterval:        model.Duration(15 * time.Second),
 			ScrapeTimeout:         DefaultGlobalConfig.ScrapeTimeout,
+			BodySizeLimit:         globBodySizeLimit,
+			SampleLimit:           globSampleLimit,
+			TargetLimit:           globTargetLimit,
+			LabelLimit:            globLabelLimit,
+			LabelNameLengthLimit:  globLabelNameLengthLimit,
+			LabelValueLengthLimit: globLabelValueLengthLimit,
 
 			MetricsPath:      DefaultScrapeConfig.MetricsPath,
 			Scheme:           DefaultScrapeConfig.Scheme,

config/testdata/conf.good.yml

@@ -2,6 +2,12 @@
 global:
   scrape_interval: 15s
   evaluation_interval: 30s
+  body_size_limit: 15MB
+  sample_limit: 1500
+  target_limit: 30
+  label_limit: 30
+  label_name_length_limit: 200
+  label_value_length_limit: 200
   # scrape_timeout is set to the global default (10s).
 
   external_labels:
@@ -111,6 +117,11 @@ scrape_configs:
 
     body_size_limit: 10MB
     sample_limit: 1000
+    target_limit: 35
+    label_limit: 35
+    label_name_length_limit: 210
+    label_value_length_limit: 210
+
 
     metrics_path: /my_path
     scheme: https

docs/configuration/configuration.md

@@ -73,6 +73,39 @@ global:
   # Reloading the configuration will reopen the file.
   [ query_log_file: <string> ]
 
+  # An uncompressed response body larger than this many bytes will cause the
+  # scrape to fail. 0 means no limit. Example: 100MB.
+  # This is an experimental feature, this behaviour could
+  # change or be removed in the future.
+  [ body_size_limit: <size> | default = 0 ]
+
+  # Per-scrape limit on number of scraped samples that will be accepted.
+  # If more than this number of samples are present after metric relabeling
+  # the entire scrape will be treated as failed. 0 means no limit.
+  [ sample_limit: <int> | default = 0 ]
+
+  # Per-scrape limit on number of labels that will be accepted for a sample. If
+  # more than this number of labels are present post metric-relabeling, the
+  # entire scrape will be treated as failed. 0 means no limit.
+  [ label_limit: <int> | default = 0 ]
+
+  # Per-scrape limit on length of labels name that will be accepted for a sample.
+  # If a label name is longer than this number post metric-relabeling, the entire
+  # scrape will be treated as failed. 0 means no limit.
+  [ label_name_length_limit: <int> | default = 0 ]
+
+  # Per-scrape limit on length of labels value that will be accepted for a sample.
+  # If a label value is longer than this number post metric-relabeling, the
+  # entire scrape will be treated as failed. 0 means no limit.
+  [ label_value_length_limit: <int> | default = 0 ]
+
+  # Per-scrape config limit on number of unique targets that will be
+  # accepted. If more than this number of targets are present after target
+  # relabeling, Prometheus will mark the targets as failed without scraping them.
+  # 0 means no limit. This is an experimental feature, this behaviour could
+  # change in the future.
+  [ target_limit: <int> | default = 0 ]
+
 # Rule files specifies a list of globs. Rules and alerts are read from
 # all matching files.
 rule_files: