Output: Azure Monitor: Cleanup and add README

plugins/outputs/azuremonitor/README.md

@@ -0,0 +1,74 @@
+## Azure Monitor Custom Metrics Output for Telegraf
+
+This plugin will send custom metrics to Azure Monitor.
+
+All metrics are written as summarized values: min, max, sum, count. The Telegraf field name is appended to the metric name. All Telegraf tags are set as the metric dimensions.
+
+## Azure Authentication
+
+This plugin can use one of several different types of credentials to authenticate
+with the Azure Monitor Custom Metrics ingestion API endpoint. In the following
+order the plugin will attempt to authenticate.
+1. Managed Service Identity (MSI) token
+    - This is the prefered authentication method.
+    - Note: MSI is only available to ARM-based resources.
+2. AAD Application Tokens (Service Principals)
+    - Primarily useful if Telegraf is writing metrics for other resources. [More information](https://docs.microsoft.com/en-us/azure/active-directory/develop/active-directory-application-objects).
+    - A Service Principal or User Principal needs to be assigned the `Monitoring Contributor` roles.
+3. AAD User Tokens (User Principals)
+    - Allows Telegraf to authenticate like a user. It is best to use this method for development.
+
+## Config
+
+For this output plugin to function correctly the following variables
+must be configured.
+
+* resourceId
+* region
+
+### region
+
+The region is the Azure region that you wish to connect to.
+Examples include but are not limited to:
+* useast
+* centralus
+* westcentralus
+* westeurope
+* southeastasia
+
+### resourceId
+
+The resourceId used for Azure Monitor metrics.
+
+### Configuration:
+
+```
+# Configuration for sending aggregate metrics to Azure Monitor
+[[outputs.azuremonitor]]
+## The resource ID against which metric will be logged.  If not
+## specified, the plugin will attempt to retrieve the resource ID
+## of the VM via the instance metadata service (optional if running 
+## on an Azure VM with MSI)
+#resourceId = "/subscriptions/<subscription-id>/resourceGroups/<resource-group>/providers/Microsoft.Compute/virtualMachines/<vm-name>"
+## Azure region to publish metrics against.  Defaults to eastus.
+## Leave blank to automatically query the region via MSI.
+#region = "useast"
+
+## Write HTTP timeout, formatted as a string.  If not provided, will default
+## to 5s. 0s means no timeout (not recommended).
+# timeout = "5s"
+
+## Whether or not to use managed service identity.
+#useManagedServiceIdentity = true
+
+## Fill in the following values if using Active Directory Service
+## Principal or User Principal for authentication.
+## Subscription ID
+#azureSubscription = ""
+## Tenant ID
+#azureTenant = ""
+## Client ID
+#azureClientId = ""
+## Client secrete
+#azureClientSecret = ""
+```

plugins/outputs/azuremonitor/azuremetadata.go

@@ -59,8 +59,8 @@ type VirtualMachineMetadata struct {
 	} `json:"network"`
 }
 
-// MsiToken is the managed service identity token
+// msiToken is the managed service identity token
-type MsiToken struct {
+type msiToken struct {
 	AccessToken  string `json:"access_token"`
 	RefreshToken string `json:"refresh_token"`
 	ExpiresIn    string `json:"expires_in"`
@@ -74,7 +74,7 @@ type MsiToken struct {
 	raw       string
 }
 
-func (m *MsiToken) parseTimes() {
+func (m *msiToken) parseTimes() {
 	val, err := strconv.ParseInt(m.ExpiresOn, 10, 64)
 	if err == nil {
 		m.expiresAt = time.Unix(val, 0)
@@ -87,23 +87,23 @@ func (m *MsiToken) parseTimes() {
 }
 
 // ExpiresAt is the time at which the token expires
-func (m *MsiToken) ExpiresAt() time.Time {
+func (m *msiToken) ExpiresAt() time.Time {
 	return m.expiresAt
 }
 
 // ExpiresInDuration returns the duration until the token expires
-func (m *MsiToken) ExpiresInDuration() time.Duration {
+func (m *msiToken) ExpiresInDuration() time.Duration {
 	expiresDuration := m.expiresAt.Sub(time.Now().UTC())
 	return expiresDuration
 }
 
 // NotBeforeTime returns the time at which the token becomes valid
-func (m *MsiToken) NotBeforeTime() time.Time {
+func (m *msiToken) NotBeforeTime() time.Time {
 	return m.notBefore
 }
 
 // GetMsiToken retrieves a managed service identity token from the specified port on the local VM
-func (s *AzureInstanceMetadata) GetMsiToken(clientID string, resourceID string) (*MsiToken, error) {
+func (s *AzureInstanceMetadata) getMsiToken(clientID string, resourceID string) (*msiToken, error) {
 	// Acquire an MSI token.  Documented at:
 	// https://docs.microsoft.com/en-us/azure/active-directory/managed-service-identity/how-to-use-vm-token
 	//
@@ -159,7 +159,7 @@ func (s *AzureInstanceMetadata) GetMsiToken(clientID string, resourceID string)
 			resp.StatusCode, resp.Status, reply)
 	}
 
-	var token MsiToken
+	var token msiToken
 	if err := json.Unmarshal(reply, &token); err != nil {
 		return nil, err
 	}

plugins/outputs/azuremonitor/azuremetadata_test.go

@@ -30,7 +30,7 @@ func TestGetTOKEN(t *testing.T) {
 	azureMetadata := &AzureInstanceMetadata{}
 
 	resourceID := "https://ingestion.monitor.azure.com/"
-	token, err := azureMetadata.GetMsiToken("", resourceID)
+	token, err := azureMetadata.getMsiToken("", resourceID)
 
 	require.NoError(t, err)
 	require.NotEmpty(t, token.AccessToken)

plugins/outputs/azuremonitor/azuremonitor.go

@@ -14,23 +14,25 @@ import (
 	"github.com/Azure/go-autorest/autorest/adal"
 	"github.com/Azure/go-autorest/autorest/azure"
 	"github.com/influxdata/telegraf"
+	"github.com/influxdata/telegraf/internal"
 	"github.com/influxdata/telegraf/plugins/outputs"
 )
 
 // AzureMonitor allows publishing of metrics to the Azure Monitor custom metrics service
 type AzureMonitor struct {
-	ResourceID          string `toml:"resourceId"`
+	ResourceID          string            `toml:"resource_id"`
 	Region              string            `toml:"region"`
-	HTTPPostTimeout     int    `toml:"httpPostTimeout"`
+	Timeout             internal.Duration `toml:"Timeout"`
-	AzureSubscriptionID string `toml:"azureSubscription"`
+	AzureSubscriptionID string            `toml:"azure_subscription"`
-	AzureTenantID       string `toml:"azureTenant"`
+	AzureTenantID       string            `toml:"azure_tenant"`
-	AzureClientID       string `toml:"azureClientId"`
+	AzureClientID       string            `toml:"azure_client_id"`
-	AzureClientSecret   string `toml:"azureClientSecret"`
+	AzureClientSecret   string            `toml:"azure_client_secret"`
+	StringAsDimension   bool              `toml:"string_as_dimension"`
 
-	useMsi           bool
+	useMsi           bool `toml:"use_managed_service_identity"`
 	metadataService  *AzureInstanceMetadata
 	instanceMetadata *VirtualMachineMetadata
-	msiToken         *MsiToken
+	msiToken         *msiToken
 	msiResource      string
 	bearerToken      string
 	expiryWatermark  time.Duration
@@ -40,7 +42,7 @@ type AzureMonitor struct {
 
 	client *http.Client
 
-	cache       map[uint64]azureMonitorMetric
+	cache       map[string]*azureMonitorMetric
 	period      time.Duration
 	delay       time.Duration
 	periodStart time.Time
@@ -79,27 +81,34 @@ var sampleConfig = `
   ## specified, the plugin will attempt to retrieve the resource ID
   ## of the VM via the instance metadata service (optional if running 
   ## on an Azure VM with MSI)
-resourceId = "/subscriptions/3e9c2afc-52b3-4137-9bba-02b6eb204331/resourceGroups/someresourcegroup-rg/providers/Microsoft.Compute/virtualMachines/somevmname"
+  #resource_id = "/subscriptions/<subscription-id>/resourceGroups/<resource-group>/providers/Microsoft.Compute/virtualMachines/<vm-name>"
-## Azure region to publish metrics against.  Defaults to eastus
+  ## Azure region to publish metrics against.  Defaults to eastus.
-region = "useast"
+  ## Leave blank to automatically query the region via MSI.
-## Maximum duration to wait for HTTP post (in seconds).  Defaults to 15
+  #region = "useast"
-httpPostTimeout = 15
-## Whether or not to use managed service identity (defaults to true).
-useManagedServiceIdentity = true
 
-## Leave this section blank to use Managed Service Identity.
+  ## Write HTTP timeout, formatted as a string.  If not provided, will default
-## TODO
+  ## to 5s. 0s means no timeout (not recommended).
-azureSubscription = "TODO"
+  # timeout = "5s"
-## TODO 
+
-azureTenant = "TODO"
+  ## Whether or not to use managed service identity.
-## TODO
+  #use_managed_service_identity = true
-azureClientId = "TODO"
+
-## TODO
+  ## Fill in the following values if using Active Directory Service
-azureClientSecret = "TODO"
+  ## Principal or User Principal for authentication.
+  ## Subscription ID
+  #azure_subscription = ""
+  ## Tenant ID
+  #azure_tenant = ""
+  ## Client ID
+  #azure_client_id = ""
+  ## Client secrete
+  #azure_client_secret = ""
 `
 
 const (
-	azureMonitorDefaultRegion = "eastus"
+	defaultRegion = "eastus"
+
+	defaultMSIResource = "https://monitoring.azure.com/"
 )
 
 // Connect initializes the plugin and validates connectivity
@@ -113,18 +122,13 @@ func (a *AzureMonitor) Connect() error {
 		return fmt.Errorf("Must provide values for azureSubscription, azureTenant, azureClient and azureClientSecret, or leave all blank to default to MSI")
 	}
 
-	if a.useMsi == false {
+	if !a.useMsi {
 		// If using direct AD authentication create the AD access client
 		oauthConfig, err := adal.NewOAuthConfig(azure.PublicCloud.ActiveDirectoryEndpoint, a.AzureTenantID)
 		if err != nil {
 			return fmt.Errorf("Could not initialize AD client: %s", err)
 		}
 		a.oauthConfig = oauthConfig
-
-	}
-
-	if a.HTTPPostTimeout == 0 {
-		a.HTTPPostTimeout = 10
 	}
 
 	a.metadataService = &AzureInstanceMetadata{}
@@ -133,7 +137,6 @@ func (a *AzureMonitor) Connect() error {
 	a.msiResource = "https://monitoring.azure.com/"
 
 	// Validate the resource identifier
-	if a.ResourceID == "" {
 	metadata, err := a.metadataService.GetInstanceMetadata()
 	if err != nil {
 		return fmt.Errorf("No resource id specified, and Azure Instance metadata service not available.  If not running on an Azure VM, provide a value for resourceId")
@@ -143,14 +146,9 @@ func (a *AzureMonitor) Connect() error {
 	if a.Region == "" {
 		a.Region = metadata.Compute.Location
 	}
-	}
-
-	if a.Region == "" {
-		a.Region = azureMonitorDefaultRegion
-	}
 
 	// Validate credentials
-	err := a.validateCredentials()
+	err = a.validateCredentials()
 	if err != nil {
 		return err
 	}
@@ -161,6 +159,45 @@ func (a *AzureMonitor) Connect() error {
 	return nil
 }
 
+func (a *AzureMonitor) validateCredentials() error {
+	// Use managed service identity
+	if a.useMsi {
+		// Check expiry on the token
+		if a.msiToken != nil {
+			expiryDuration := a.msiToken.ExpiresInDuration()
+			if expiryDuration > a.expiryWatermark {
+				return nil
+			}
+
+			// Token is about to expire
+			log.Printf("Bearer token expiring in %s; acquiring new token\n", expiryDuration.String())
+			a.msiToken = nil
+		}
+
+		// No token, acquire an MSI token
+		if a.msiToken == nil {
+			msiToken, err := a.metadataService.getMsiToken(a.AzureClientID, a.msiResource)
+			if err != nil {
+				return err
+			}
+			log.Printf("Bearer token acquired; expiring in %s\n", msiToken.ExpiresInDuration().String())
+			a.msiToken = msiToken
+			a.bearerToken = msiToken.AccessToken
+		}
+		// Otherwise directory acquire a token
+	} else {
+		adToken, err := adal.NewServicePrincipalToken(
+			*(a.oauthConfig), a.AzureClientID, a.AzureClientSecret,
+			azure.PublicCloud.ActiveDirectoryEndpoint)
+		if err != nil {
+			return fmt.Errorf("Could not acquire ADAL token: %s", err)
+		}
+		a.adalToken = adToken
+	}
+
+	return nil
+}
+
 // Description provides a description of the plugin
 func (a *AzureMonitor) Description() string {
 	return "Configuration for sending aggregate metrics to Azure Monitor"
@@ -180,9 +217,7 @@ func (a *AzureMonitor) Close() error {
 
 // Write writes metrics to the remote endpoint
 func (a *AzureMonitor) Write(metrics []telegraf.Metric) error {
-	log.Printf("metrics collected: %+v", metrics)
+	// Assemble basic stats on incoming metrics
-
-	// Assemble stats on incoming metrics
 	for _, metric := range metrics {
 		select {
 		case a.metrics <- metric:
@@ -194,257 +229,6 @@ func (a *AzureMonitor) Write(metrics []telegraf.Metric) error {
 	return nil
 }
 
-func (a *AzureMonitor) validateCredentials() error {
-	// Use managed service identity
-	if a.useMsi {
-		// Check expiry on the token
-		if a.msiToken != nil {
-			expiryDuration := a.msiToken.ExpiresInDuration()
-			if expiryDuration > a.expiryWatermark {
-				return nil
-			}
-
-			// Token is about to expire
-			log.Printf("Bearer token expiring in %s; acquiring new token\n", expiryDuration.String())
-			a.msiToken = nil
-		}
-
-		// No token, acquire an MSI token
-		if a.msiToken == nil {
-			msiToken, err := a.metadataService.GetMsiToken(a.AzureClientID, a.msiResource)
-			if err != nil {
-				return err
-			}
-			log.Printf("Bearer token acquired; expiring in %s\n", msiToken.ExpiresInDuration().String())
-			a.msiToken = msiToken
-			a.bearerToken = msiToken.AccessToken
-		}
-		// Otherwise directory acquire a token
-	} else {
-		adToken, err := adal.NewServicePrincipalToken(
-			*(a.oauthConfig), a.AzureClientID, a.AzureClientSecret,
-			azure.PublicCloud.ActiveDirectoryEndpoint)
-		if err != nil {
-			return fmt.Errorf("Could not acquire ADAL token: %s", err)
-		}
-		a.adalToken = adToken
-	}
-
-	return nil
-}
-
-func (a *AzureMonitor) add(metric telegraf.Metric) {
-	id := metric.HashID()
-	if azm, ok := a.cache[id]; !ok {
-		// hit an uncached metric, create caches for first time:
-		var dimensionNames []string
-		var dimensionValues []string
-		for i, tag := range metric.TagList() {
-			// Azure custom metrics service supports up to 10 dimensions
-			if i > 9 {
-				continue
-			}
-			dimensionNames = append(dimensionNames, tag.Key)
-			dimensionValues = append(dimensionValues, tag.Value)
-		}
-		// Field keys are stored as the last dimension
-		dimensionNames = append(dimensionNames, "field")
-
-		var seriesList []*azureMonitorSeries
-		// Store each field as a separate series with field key as a new dimension
-		for _, field := range metric.FieldList() {
-			azmseries := newAzureMonitorSeries(field, dimensionValues)
-			seriesList = append(seriesList, azmseries)
-		}
-
-		if len(seriesList) < 1 {
-			log.Printf("no valid fields for metric: %s", metric)
-			return
-		}
-
-		a.cache[id] = azureMonitorMetric{
-			Time: metric.Time(),
-			Data: &azureMonitorData{
-				BaseData: &azureMonitorBaseData{
-					Metric:         metric.Name(),
-					Namespace:      "default",
-					DimensionNames: dimensionNames,
-					Series:         seriesList,
-				},
-			},
-		}
-	} else {
-		for _, f := range metric.FieldList() {
-			fv, ok := convert(f.Value)
-			if !ok {
-				continue
-			}
-
-			tmp, ok := azm.findSeriesWithField(f.Key)
-			if !ok {
-				// hit an uncached field of a cached metric
-				var dimensionValues []string
-				for i, tag := range metric.TagList() {
-					// Azure custom metrics service supports up to 10 dimensions
-					if i > 9 {
-						continue
-					}
-					dimensionValues = append(dimensionValues, tag.Value)
-				}
-				azm.Data.BaseData.Series = append(azm.Data.BaseData.Series, newAzureMonitorSeries(f, dimensionValues))
-				continue
-			}
-
-			//counter compute
-			n := tmp.Count + 1
-			tmp.Count = n
-			//max/min compute
-			if fv < tmp.Min {
-				tmp.Min = fv
-			} else if fv > tmp.Max {
-				tmp.Max = fv
-			}
-			//sum compute
-			tmp.Sum += fv
-			//store final data
-			a.cache[id].Data.BaseData.Series = append(a.cache[id].Data.BaseData.Series, tmp)
-		}
-	}
-}
-
-func (b *azureMonitorMetric) findSeriesWithField(f string) (*azureMonitorSeries, bool) {
-	if len(b.Data.BaseData.Series) > 0 {
-		for _, s := range b.Data.BaseData.Series {
-			if f == s.DimensionValues[len(s.DimensionValues)-1] {
-				return s, true
-			}
-		}
-	}
-	return nil, false
-}
-
-func newAzureMonitorSeries(f *telegraf.Field, dv []string) *azureMonitorSeries {
-	fv, ok := convert(f.Value)
-	if !ok {
-		log.Printf("unable to convert field %s (type %T) to float type: %v", f.Key, fv, fv)
-		return nil
-	}
-	return &azureMonitorSeries{
-		DimensionValues: append(append([]string{}, dv...), f.Key),
-		Min:             fv,
-		Max:             fv,
-		Sum:             fv,
-		Count:           1,
-	}
-}
-
-func (a *AzureMonitor) reset() {
-	a.cache = make(map[uint64]azureMonitorMetric)
-}
-
-func convert(in interface{}) (float64, bool) {
-	switch v := in.(type) {
-	case int:
-		return float64(v), true
-	case int8:
-		return float64(v), true
-	case int16:
-		return float64(v), true
-	case int32:
-		return float64(v), true
-	case int64:
-		return float64(v), true
-	case uint:
-		return float64(v), true
-	case uint8:
-		return float64(v), true
-	case uint16:
-		return float64(v), true
-	case uint32:
-		return float64(v), true
-	case uint64:
-		return float64(v), true
-	case float32:
-		return float64(v), true
-	case float64:
-		return v, true
-	case string:
-		f, err := strconv.ParseFloat(v, 64)
-		if err != nil {
-			log.Printf("converted string: %s to %v", v, f)
-			return 0, false
-		}
-		return f, true
-	default:
-		log.Printf("did not convert %T: %s", v, v)
-		return 0, false
-	}
-}
-
-func (a *AzureMonitor) push() {
-	var body []byte
-	for _, metric := range a.cache {
-		jsonBytes, err := json.Marshal(&metric)
-		log.Printf("marshalled point %s", jsonBytes)
-		if err != nil {
-			log.Printf("Error marshalling metrics %s", err)
-			return
-		}
-		body = append(body, jsonBytes...)
-		body = append(body, '\n')
-	}
-
-	log.Printf("Publishing metrics %s", body)
-	_, err := a.postData(&body)
-	if err != nil {
-		log.Printf("Error publishing metrics %s", err)
-		return
-	}
-
-	return
-}
-
-func (a *AzureMonitor) postData(msg *[]byte) (*http.Request, error) {
-	metricsEndpoint := fmt.Sprintf("https://%s.monitoring.azure.com%s/metrics",
-		a.Region, a.ResourceID)
-
-	req, err := http.NewRequest("POST", metricsEndpoint, bytes.NewBuffer(*msg))
-	if err != nil {
-		log.Printf("Error creating HTTP request")
-		return nil, err
-	}
-
-	req.Header.Set("Authorization", "Bearer "+a.bearerToken)
-	req.Header.Set("Content-Type", "application/x-ndjson")
-
-	tr := &http.Transport{
-		TLSClientConfig: &tls.Config{InsecureSkipVerify: true},
-	}
-	client := http.Client{
-		Transport: tr,
-		// TODO - fix this
-		//Timeout: time.Duration(s.HTTPPostTimeout * time.Second),
-		Timeout: time.Duration(10 * time.Second),
-	}
-	resp, err := client.Do(req)
-	if err != nil {
-		return req, err
-	}
-
-	defer resp.Body.Close()
-	if resp.StatusCode >= 300 || resp.StatusCode < 200 {
-		var reply []byte
-		reply, err = ioutil.ReadAll(resp.Body)
-
-		if err != nil {
-			reply = nil
-		}
-		return req, fmt.Errorf("Post Error. HTTP response code:%d message:%s reply:\n%s",
-			resp.StatusCode, resp.Status, reply)
-	}
-	return req, nil
-}
-
 func (a *AzureMonitor) run() {
 	// The start of the period is truncated to the nearest minute.
 	//
@@ -495,9 +279,210 @@ func (a *AzureMonitor) run() {
 	}
 }
 
+func (a *AzureMonitor) reset() {
+	a.cache = make(map[string]*azureMonitorMetric)
+}
+
+func (a *AzureMonitor) add(metric telegraf.Metric) {
+	var dimensionNames []string
+	var dimensionValues []string
+	for i, tag := range metric.TagList() {
+		// Azure custom metrics service supports up to 10 dimensions
+		if i > 10 {
+			continue
+		}
+		dimensionNames = append(dimensionNames, tag.Key)
+		dimensionValues = append(dimensionValues, tag.Value)
+	}
+
+	// Azure Monitoe does not support string value types, so convert string
+	// fields to dimensions if enabled.
+	if a.StringAsDimension {
+		for _, f := range metric.FieldList() {
+			switch fv := f.Value.(type) {
+			case string:
+				dimensionNames = append(dimensionNames, f.Key)
+				dimensionValues = append(dimensionValues, fv)
+				metric.RemoveField(f.Key)
+			}
+		}
+	}
+
+	for _, f := range metric.FieldList() {
+		name := metric.Name() + "_" + f.Key
+		fv, ok := convert(f.Value)
+		if !ok {
+			log.Printf("unable to convert field %s (type %T) to float type: %v", f.Key, fv, fv)
+			continue
+		}
+
+		if azm, ok := a.cache[name]; !ok {
+			// hit an uncached metric, create it for first time
+			a.cache[name] = &azureMonitorMetric{
+				Time: metric.Time(),
+				Data: &azureMonitorData{
+					BaseData: &azureMonitorBaseData{
+						Metric:         name,
+						Namespace:      "default",
+						DimensionNames: dimensionNames,
+						Series: []*azureMonitorSeries{
+							newAzureMonitorSeries(dimensionValues, fv),
+						},
+					},
+				},
+			}
+		} else {
+			tmp, i, ok := azm.findSeries(dimensionValues)
+			if !ok {
+				// add series new series (should be rare)
+				n := append(azm.Data.BaseData.Series, newAzureMonitorSeries(dimensionValues, fv))
+				a.cache[name].Data.BaseData.Series = n
+				continue
+			}
+
+			//counter compute
+			n := tmp.Count + 1
+			tmp.Count = n
+			//max/min compute
+			if fv < tmp.Min {
+				tmp.Min = fv
+			} else if fv > tmp.Max {
+				tmp.Max = fv
+			}
+			//sum compute
+			tmp.Sum += fv
+			//store final data
+			a.cache[name].Data.BaseData.Series[i] = tmp
+		}
+	}
+}
+
+func (m *azureMonitorMetric) findSeries(dv []string) (*azureMonitorSeries, int, bool) {
+	if len(m.Data.BaseData.DimensionNames) != len(dv) {
+		return nil, 0, false
+	}
+	for i := range m.Data.BaseData.Series {
+		if m.Data.BaseData.Series[i].equal(dv) {
+			return m.Data.BaseData.Series[i], i, true
+		}
+	}
+	return nil, 0, false
+}
+
+func newAzureMonitorSeries(dv []string, fv float64) *azureMonitorSeries {
+	return &azureMonitorSeries{
+		DimensionValues: append([]string{}, dv...),
+		Min:             fv,
+		Max:             fv,
+		Sum:             fv,
+		Count:           1,
+	}
+}
+
+func (s *azureMonitorSeries) equal(dv []string) bool {
+	if len(s.DimensionValues) != len(dv) {
+		return false
+	}
+	for i := range dv {
+		if dv[i] != s.DimensionValues[i] {
+			return false
+		}
+	}
+	return true
+}
+
+func convert(in interface{}) (float64, bool) {
+	switch v := in.(type) {
+	case int64:
+		return float64(v), true
+	case uint64:
+		return float64(v), true
+	case float64:
+		return v, true
+	case bool:
+		if v {
+			return 1, true
+		}
+		return 1, true
+	case string:
+		f, err := strconv.ParseFloat(v, 64)
+		if err != nil {
+			return 0, false
+		}
+		return f, true
+	default:
+		return 0, false
+	}
+}
+
+func (a *AzureMonitor) push() {
+	var body []byte
+	for _, metric := range a.cache {
+		jsonBytes, err := json.Marshal(&metric)
+		if err != nil {
+			log.Printf("Error marshalling metrics %s", err)
+			return
+		}
+		body = append(body, jsonBytes...)
+		body = append(body, '\n')
+	}
+
+	_, err := a.postData(&body)
+	if err != nil {
+		log.Printf("Error publishing aggregate metrics %s", err)
+	}
+	return
+}
+
+func (a *AzureMonitor) postData(msg *[]byte) (*http.Request, error) {
+	if err := a.validateCredentials(); err != nil {
+		return nil, fmt.Errorf("Error authenticating: %v", err)
+	}
+
+	metricsEndpoint := fmt.Sprintf("https://%s.monitoring.azure.com%s/metrics",
+		a.Region, a.ResourceID)
+
+	req, err := http.NewRequest("POST", metricsEndpoint, bytes.NewBuffer(*msg))
+	if err != nil {
+		log.Printf("Error creating HTTP request")
+		return nil, err
+	}
+
+	req.Header.Set("Authorization", "Bearer "+a.bearerToken)
+	req.Header.Set("Content-Type", "application/x-ndjson")
+
+	tr := &http.Transport{
+		TLSClientConfig: &tls.Config{InsecureSkipVerify: true},
+	}
+	client := http.Client{
+		Transport: tr,
+		Timeout:   a.Timeout.Duration,
+	}
+	resp, err := client.Do(req)
+	if err != nil {
+		return req, err
+	}
+
+	defer resp.Body.Close()
+	if resp.StatusCode >= 300 || resp.StatusCode < 200 {
+		var reply []byte
+		reply, err = ioutil.ReadAll(resp.Body)
+
+		if err != nil {
+			reply = nil
+		}
+		return req, fmt.Errorf("Post Error. HTTP response code:%d message:%s reply:\n%s",
+			resp.StatusCode, resp.Status, reply)
+	}
+	return req, nil
+}
+
 func init() {
 	outputs.Add("azuremonitor", func() telegraf.Output {
 		return &AzureMonitor{
+			StringAsDimension: true,
+			Timeout:           internal.Duration{Duration: time.Second * 5},
+			Region:            defaultRegion,
 			period:            time.Minute,
 			delay:             time.Second * 5,
 			metrics:           make(chan telegraf.Metric, 100),