Updating dependency go.opencensus.io to version v0.22.2

Signed-off-by: Davanum Srinivas <davanum@gmail.com>

vendor/go.opencensus.io/plugin/ochttp/server.go

@@ -70,6 +70,12 @@ type Handler struct {
 	// from the information found in the incoming HTTP Request. By default the
 	// name equals the URL Path.
 	FormatSpanName func(*http.Request) string
+
+	// IsHealthEndpoint holds the function to use for determining if the
+	// incoming HTTP request should be considered a health check. This is in
+	// addition to the private isHealthEndpoint func which may also indicate
+	// tracing should be skipped.
+	IsHealthEndpoint func(*http.Request) bool
 }
 
 func (h *Handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
@@ -87,7 +93,7 @@ func (h *Handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 }
 
 func (h *Handler) startTrace(w http.ResponseWriter, r *http.Request) (*http.Request, func()) {
-	if isHealthEndpoint(r.URL.Path) {
+	if h.IsHealthEndpoint != nil && h.IsHealthEndpoint(r) || isHealthEndpoint(r.URL.Path) {
 		return r, func() {}
 	}
 	var name string
@@ -128,7 +134,7 @@ func (h *Handler) startTrace(w http.ResponseWriter, r *http.Request) (*http.Requ
 		// TODO: Handle cases where ContentLength is not set.
 	} else if r.ContentLength > 0 {
 		span.AddMessageReceiveEvent(0, /* TODO: messageID */
-			int64(r.ContentLength), -1)
+			r.ContentLength, -1)
 	}
 	return r.WithContext(ctx), span.End
 }
@@ -174,8 +180,6 @@ type trackingResponseWriter struct {
 // Compile time assertion for ResponseWriter interface
 var _ http.ResponseWriter = (*trackingResponseWriter)(nil)
 
-var logTagsErrorOnce sync.Once
-
 func (t *trackingResponseWriter) end(tags *addedTags) {
 	t.endOnce.Do(func() {
 		if t.statusCode == 0 {

vendor/go.opencensus.io/plugin/ochttp/stats.go

@@ -92,38 +92,38 @@ var (
 	// The value of this tag can be controlled by the HTTP client, so you need
 	// to watch out for potentially generating high-cardinality labels in your
 	// metrics backend if you use this tag in views.
-	Host, _ = tag.NewKey("http.host")
+	Host = tag.MustNewKey("http.host")
 
 	// StatusCode is the numeric HTTP response status code,
 	// or "error" if a transport error occurred and no status code was read.
-	StatusCode, _ = tag.NewKey("http.status")
+	StatusCode = tag.MustNewKey("http.status")
 
 	// Path is the URL path (not including query string) in the request.
 	//
 	// The value of this tag can be controlled by the HTTP client, so you need
 	// to watch out for potentially generating high-cardinality labels in your
 	// metrics backend if you use this tag in views.
-	Path, _ = tag.NewKey("http.path")
+	Path = tag.MustNewKey("http.path")
 
 	// Method is the HTTP method of the request, capitalized (GET, POST, etc.).
-	Method, _ = tag.NewKey("http.method")
+	Method = tag.MustNewKey("http.method")
 
 	// KeyServerRoute is a low cardinality string representing the logical
 	// handler of the request. This is usually the pattern registered on the a
 	// ServeMux (or similar string).
-	KeyServerRoute, _ = tag.NewKey("http_server_route")
+	KeyServerRoute = tag.MustNewKey("http_server_route")
 )
 
 // Client tag keys.
 var (
 	// KeyClientMethod is the HTTP method, capitalized (i.e. GET, POST, PUT, DELETE, etc.).
-	KeyClientMethod, _ = tag.NewKey("http_client_method")
+	KeyClientMethod = tag.MustNewKey("http_client_method")
 	// KeyClientPath is the URL path (not including query string).
-	KeyClientPath, _ = tag.NewKey("http_client_path")
+	KeyClientPath = tag.MustNewKey("http_client_path")
 	// KeyClientStatus is the HTTP status code as an integer (e.g. 200, 404, 500.), or "error" if no response status line was received.
-	KeyClientStatus, _ = tag.NewKey("http_client_status")
+	KeyClientStatus = tag.MustNewKey("http_client_status")
 	// KeyClientHost is the value of the request Host header.
-	KeyClientHost, _ = tag.NewKey("http_client_host")
+	KeyClientHost = tag.MustNewKey("http_client_host")
 )
 
 // Default distributions used by views in this package.

vendor/go.opencensus.io/plugin/ochttp/trace.go

@@ -186,6 +186,8 @@ func TraceStatus(httpStatusCode int, statusLine string) trace.Status {
 		code = trace.StatusCodeCancelled
 	case http.StatusBadRequest:
 		code = trace.StatusCodeInvalidArgument
+	case http.StatusUnprocessableEntity:
+		code = trace.StatusCodeInvalidArgument
 	case http.StatusGatewayTimeout:
 		code = trace.StatusCodeDeadlineExceeded
 	case http.StatusNotFound: