fix Azure receiver not azure china (open-telemetry#34402)

Fixes open-telemetry#34315

---------

Co-authored-by: Curtis Robert <crobert@splunk.com>

.chloggen/mo-silent_fix-34315.yaml

@@ -0,0 +1,27 @@
+# Use this changelog template to create an entry for release notes.
+
+# One of 'breaking', 'deprecation', 'new_component', 'enhancement', 'bug_fix'
+change_type: 'bug_fix'
+
+# The name of the component, or a single word describing the area of concern, (e.g. filelogreceiver)
+component: azuremonitorreceiver
+
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: Add Azure China as a `cloud` option.
+
+# Mandatory: One or more tracking issues related to the change. You can use the PR number here if no issue exists.
+issues: [34315]
+
+# (Optional) One or more lines of additional information to render under the primary note.
+# These lines will be padded with 2 spaces and then inserted directly into the document.
+# Use pipe (|) for multiline entries.
+subtext:
+
+# If your change doesn't affect end users or the exported elements of any package,
+# you should instead start your pull request title with [chore] or use the "Skip Changelog" label.
+# Optional: The change log or logs in which this entry should be included.
+# e.g. '[user]' or '[user, api]'
+# Include 'user' if the change is relevant to end users.
+# Include 'api' if there is a change to a library API.
+# Default: '[user]'
+change_logs: [user]

receiver/azuremonitorreceiver/README.md

@@ -30,7 +30,7 @@ The following settings are optional:
 - `maximum_number_of_metrics_in_a_call` (default = 20): Maximum number of metrics to fetch in per API call, current limit in Azure is 20 (as of 03/27/2023).
 - `maximum_number_of_records_per_resource` (default = 10): Maximum number of records to fetch per resource.
 - `initial_delay` (default = `1s`): defines how long this receiver waits before starting.
-- `cloud` (default = `AzureCloud`): defines which Azure cloud to use. Either `AzureCloud` or `AzureUSGovernment`
+- `cloud` (default = `AzureCloud`): defines which Azure cloud to use. Valid values: `AzureCloud`, `AzureUSGovernment`, `AzureChinaCloud`.
 
 Authenticating using service principal requires following additional settings:
 

receiver/azuremonitorreceiver/config.go

@@ -16,6 +16,7 @@ import (
 const (
 	azureCloud           = "AzureCloud"
 	azureGovernmentCloud = "AzureUSGovernment"
+	azureChinaCloud      = "AzureChinaCloud"
 )
 
 var (
@@ -292,7 +293,7 @@ func (c Config) Validate() (err error) {
 		return fmt.Errorf("authentication %v is not supported. supported authentications include [%v,%v,%v,%v]", c.Authentication, servicePrincipal, workloadIdentity, managedIdentity, defaultCredentials)
 	}
 
-	if c.Cloud != azureCloud && c.Cloud != azureGovernmentCloud {
+	if c.Cloud != azureCloud && c.Cloud != azureGovernmentCloud && c.Cloud != azureChinaCloud {
 		err = multierr.Append(err, errInvalidCloud)
 	}
 

receiver/azuremonitorreceiver/scraper.go

@@ -126,6 +126,8 @@ func (s *azureScraper) getArmClientOptions() *arm.ClientOptions {
 	switch s.cfg.Cloud {
 	case azureGovernmentCloud:
 		cloudToUse = cloud.AzureGovernment
+	case azureChinaCloud:
+		cloudToUse = cloud.AzureChina
 	default:
 		cloudToUse = cloud.AzurePublic
 	}

receiver/azuremonitorreceiver/scraper_test.go

@@ -6,12 +6,14 @@ package azuremonitorreceiver // import "github.com/open-telemetry/opentelemetry-
 import (
 	"context"
 	"path/filepath"
+	"reflect"
 	"strings"
 	"sync"
 	"testing"
 
 	"github.com/Azure/azure-sdk-for-go/sdk/azcore"
 	"github.com/Azure/azure-sdk-for-go/sdk/azcore/arm"
+	"github.com/Azure/azure-sdk-for-go/sdk/azcore/cloud"
 	"github.com/Azure/azure-sdk-for-go/sdk/azcore/runtime"
 	"github.com/Azure/azure-sdk-for-go/sdk/azidentity"
 	"github.com/Azure/azure-sdk-for-go/sdk/resourcemanager/monitor/armmonitor"
@@ -722,3 +724,64 @@ func getMetricsValuesMockData() map[string]map[string]armmonitor.MetricsClientLi
 		},
 	}
 }
+
+func TestAzureScraperClientOptions(t *testing.T) {
+	type fields struct {
+		cfg *Config
+	}
+	tests := []struct {
+		name   string
+		fields fields
+		want   *arm.ClientOptions
+	}{
+		{
+			name: "AzureCloud_options",
+			fields: fields{
+				cfg: &Config{
+					Cloud: azureCloud,
+				},
+			},
+			want: &arm.ClientOptions{
+				ClientOptions: azcore.ClientOptions{
+					Cloud: cloud.AzurePublic,
+				},
+			},
+		},
+		{
+			name: "AzureGovernmentCloud_options",
+			fields: fields{
+				cfg: &Config{
+					Cloud: azureGovernmentCloud,
+				},
+			},
+			want: &arm.ClientOptions{
+				ClientOptions: azcore.ClientOptions{
+					Cloud: cloud.AzureGovernment,
+				},
+			},
+		},
+		{
+			name: "AzureChinaCloud_options",
+			fields: fields{
+				cfg: &Config{
+					Cloud: azureChinaCloud,
+				},
+			},
+			want: &arm.ClientOptions{
+				ClientOptions: azcore.ClientOptions{
+					Cloud: cloud.AzureChina,
+				},
+			},
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			s := &azureScraper{
+				cfg: tt.fields.cfg,
+			}
+			if got := s.getArmClientOptions(); !reflect.DeepEqual(got, tt.want) {
+				t.Errorf("getArmClientOptions() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}