Replace go-grpc-prometheus with go-grpc-middleware/providers/prometheus

Fixes #9806

go-grpc-prometheus is deprecated. The new location it was moved to also introduced
an entirely new api, but afaict this matches what we have at the moment.

Signed-off-by: Danny Canter <danny@dcantah.dev>

vendor/github.com/grpc-ecosystem/go-grpc-middleware/providers/prometheus/client_metrics.go

@@ -0,0 +1,117 @@
+// Copyright (c) The go-grpc-middleware Authors.
+// Licensed under the Apache License 2.0.
+
+package prometheus
+
+import (
+	"github.com/grpc-ecosystem/go-grpc-middleware/v2/interceptors"
+	"github.com/prometheus/client_golang/prometheus"
+	"google.golang.org/grpc"
+)
+
+// ClientMetrics represents a collection of metrics to be registered on a
+// Prometheus metrics registry for a gRPC client.
+type ClientMetrics struct {
+	clientStartedCounter    *prometheus.CounterVec
+	clientHandledCounter    *prometheus.CounterVec
+	clientStreamMsgReceived *prometheus.CounterVec
+	clientStreamMsgSent     *prometheus.CounterVec
+
+	// clientHandledHistogram can be nil
+	clientHandledHistogram *prometheus.HistogramVec
+	// clientStreamRecvHistogram can be nil
+	clientStreamRecvHistogram *prometheus.HistogramVec
+	// clientStreamSendHistogram can be nil
+	clientStreamSendHistogram *prometheus.HistogramVec
+}
+
+// NewClientMetrics returns a new ClientMetrics object.
+// NOTE: Remember to register ClientMetrics object using prometheus registry
+// e.g. prometheus.MustRegister(myClientMetrics).
+func NewClientMetrics(opts ...ClientMetricsOption) *ClientMetrics {
+	var config clientMetricsConfig
+	config.apply(opts)
+	return &ClientMetrics{
+		clientStartedCounter: prometheus.NewCounterVec(
+			config.counterOpts.apply(prometheus.CounterOpts{
+				Name: "grpc_client_started_total",
+				Help: "Total number of RPCs started on the client.",
+			}), []string{"grpc_type", "grpc_service", "grpc_method"}),
+
+		clientHandledCounter: prometheus.NewCounterVec(
+			config.counterOpts.apply(prometheus.CounterOpts{
+				Name: "grpc_client_handled_total",
+				Help: "Total number of RPCs completed by the client, regardless of success or failure.",
+			}), []string{"grpc_type", "grpc_service", "grpc_method", "grpc_code"}),
+
+		clientStreamMsgReceived: prometheus.NewCounterVec(
+			config.counterOpts.apply(prometheus.CounterOpts{
+				Name: "grpc_client_msg_received_total",
+				Help: "Total number of RPC stream messages received by the client.",
+			}), []string{"grpc_type", "grpc_service", "grpc_method"}),
+
+		clientStreamMsgSent: prometheus.NewCounterVec(
+			config.counterOpts.apply(prometheus.CounterOpts{
+				Name: "grpc_client_msg_sent_total",
+				Help: "Total number of gRPC stream messages sent by the client.",
+			}), []string{"grpc_type", "grpc_service", "grpc_method"}),
+
+		clientHandledHistogram:    config.clientHandledHistogram,
+		clientStreamRecvHistogram: config.clientStreamRecvHistogram,
+		clientStreamSendHistogram: config.clientStreamSendHistogram,
+	}
+}
+
+// Describe sends the super-set of all possible descriptors of metrics
+// collected by this Collector to the provided channel and returns once
+// the last descriptor has been sent.
+func (m *ClientMetrics) Describe(ch chan<- *prometheus.Desc) {
+	m.clientStartedCounter.Describe(ch)
+	m.clientHandledCounter.Describe(ch)
+	m.clientStreamMsgReceived.Describe(ch)
+	m.clientStreamMsgSent.Describe(ch)
+	if m.clientHandledHistogram != nil {
+		m.clientHandledHistogram.Describe(ch)
+	}
+	if m.clientStreamRecvHistogram != nil {
+		m.clientStreamRecvHistogram.Describe(ch)
+	}
+	if m.clientStreamSendHistogram != nil {
+		m.clientStreamSendHistogram.Describe(ch)
+	}
+}
+
+// Collect is called by the Prometheus registry when collecting
+// metrics. The implementation sends each collected metric via the
+// provided channel and returns once the last metric has been sent.
+func (m *ClientMetrics) Collect(ch chan<- prometheus.Metric) {
+	m.clientStartedCounter.Collect(ch)
+	m.clientHandledCounter.Collect(ch)
+	m.clientStreamMsgReceived.Collect(ch)
+	m.clientStreamMsgSent.Collect(ch)
+	if m.clientHandledHistogram != nil {
+		m.clientHandledHistogram.Collect(ch)
+	}
+	if m.clientStreamRecvHistogram != nil {
+		m.clientStreamRecvHistogram.Collect(ch)
+	}
+	if m.clientStreamSendHistogram != nil {
+		m.clientStreamSendHistogram.Collect(ch)
+	}
+}
+
+// UnaryClientInterceptor is a gRPC client-side interceptor that provides Prometheus monitoring for Unary RPCs.
+func (m *ClientMetrics) UnaryClientInterceptor(opts ...Option) grpc.UnaryClientInterceptor {
+	return interceptors.UnaryClientInterceptor(&reportable{
+		opts:          opts,
+		clientMetrics: m,
+	})
+}
+
+// StreamClientInterceptor is a gRPC client-side interceptor that provides Prometheus monitoring for Streaming RPCs.
+func (m *ClientMetrics) StreamClientInterceptor(opts ...Option) grpc.StreamClientInterceptor {
+	return interceptors.StreamClientInterceptor(&reportable{
+		opts:          opts,
+		clientMetrics: m,
+	})
+}