Support query params

exporters/otlp/otlpmetric/otlpmetrichttp/client.go

@@ -80,6 +80,16 @@ func newClient(cfg oconf.Config) (*client, error) {
 	if cfg.Metrics.Insecure {
 		u.Scheme = "http"
 	}
+
+	// Add query parameters to the URL
+	if len(cfg.Metrics.QueryParams) > 0 {
+		query := u.Query()
+		for key, value := range cfg.Metrics.QueryParams {
+			query.Set(key, value)
+		}
+		u.RawQuery = query.Encode()
+	}
+
 	// Body is set when this is cloned during upload.
 	req, err := http.NewRequest(http.MethodPost, u.String(), http.NoBody)
 	if err != nil {

exporters/otlp/otlpmetric/otlpmetrichttp/config.go

@@ -222,3 +222,12 @@ func WithAggregationSelector(selector metric.AggregationSelector) Option {
 func WithProxy(pf HTTPTransportProxyFunc) Option {
 	return wrappedOption{oconf.WithProxy(oconf.HTTPTransportProxyFunc(pf))}
 }
+
+// WithQueryParams sets the query parameters to be included in the endpoint URL.
+//
+// If query parameters are provided in the endpoint URL, they will be merged
+// with the parameters set using this function. Parameters set using this
+// function will take precedence in case of conflicts.
+func WithQueryParams(params map[string]string) Option {
+	return wrappedOption{oconf.WithQueryParams(params)}
+}

exporters/otlp/otlpmetric/otlpmetrichttp/internal/oconf/options.go

@@ -56,6 +56,7 @@ type (
 		Compression Compression
 		Timeout     time.Duration
 		URLPath     string
+		QueryParams map[string]string // New variable to store query params
 
 		// gRPC configurations
 		GRPCCredentials credentials.TransportCredentials
@@ -290,6 +291,17 @@ func WithEndpointURL(v string) GenericOption {
 		cfg.Metrics.URLPath = u.Path
 		cfg.Metrics.Insecure = u.Scheme != "https"
 
+		// Extract and store query parameters
+		if u.RawQuery != "" {
+			queryParams := make(map[string]string)
+			for key, values := range u.Query() {
+				if len(values) > 0 {
+					queryParams[key] = values[0]
+				}
+			}
+			cfg.Metrics.QueryParams = queryParams // New variable to store query params
+		}
+
 		return cfg
 	})
 }
@@ -373,3 +385,15 @@ func WithProxy(pf HTTPTransportProxyFunc) GenericOption {
 		return cfg
 	})
 }
+
+func WithQueryParams(params map[string]string) HTTPOption {
+	return NewHTTPOption(func(cfg Config) Config {
+		if cfg.Metrics.QueryParams == nil {
+			cfg.Metrics.QueryParams = make(map[string]string)
+		}
+		for key, value := range params {
+			cfg.Metrics.QueryParams[key] = value
+		}
+		return cfg
+	})
+}