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/options.go

@@ -0,0 +1,129 @@
+// Copyright (c) The go-grpc-middleware Authors.
+// Licensed under the Apache License 2.0.
+
+package prometheus
+
+import (
+	"github.com/prometheus/client_golang/prometheus"
+	"google.golang.org/grpc"
+	"google.golang.org/grpc/status"
+)
+
+// FromError returns a grpc status. If the error code is neither a valid grpc status nor a context error, codes.Unknown
+// will be set.
+func FromError(err error) *status.Status {
+	s, ok := status.FromError(err)
+	// Mirror what the grpc server itself does, i.e. also convert context errors to status
+	if !ok {
+		s = status.FromContextError(err)
+	}
+	return s
+}
+
+// A CounterOption lets you add options to Counter metrics using With* funcs.
+type CounterOption func(*prometheus.CounterOpts)
+
+type counterOptions []CounterOption
+
+func (co counterOptions) apply(o prometheus.CounterOpts) prometheus.CounterOpts {
+	for _, f := range co {
+		f(&o)
+	}
+	return o
+}
+
+// WithConstLabels allows you to add ConstLabels to Counter metrics.
+func WithConstLabels(labels prometheus.Labels) CounterOption {
+	return func(o *prometheus.CounterOpts) {
+		o.ConstLabels = labels
+	}
+}
+
+// WithSubsystem allows you to add a Subsystem to Counter metrics.
+func WithSubsystem(subsystem string) CounterOption {
+	return func(o *prometheus.CounterOpts) {
+		o.Subsystem = subsystem
+	}
+}
+
+// A HistogramOption lets you add options to Histogram metrics using With*
+// funcs.
+type HistogramOption func(*prometheus.HistogramOpts)
+
+type histogramOptions []HistogramOption
+
+func (ho histogramOptions) apply(o prometheus.HistogramOpts) prometheus.HistogramOpts {
+	for _, f := range ho {
+		f(&o)
+	}
+	return o
+}
+
+// WithHistogramBuckets allows you to specify custom bucket ranges for histograms if EnableHandlingTimeHistogram is on.
+func WithHistogramBuckets(buckets []float64) HistogramOption {
+	return func(o *prometheus.HistogramOpts) { o.Buckets = buckets }
+}
+
+// WithHistogramOpts allows you to specify HistogramOpts but makes sure the correct name and label is used.
+// This function is helpful when specifying more than just the buckets, like using NativeHistograms.
+func WithHistogramOpts(opts *prometheus.HistogramOpts) HistogramOption {
+	// TODO: This isn't ideal either if new fields are added to prometheus.HistogramOpts.
+	// Maybe we can change the interface to accept abitrary HistogramOpts and
+	// only make sure to overwrite the necessary fields (name, labels).
+	return func(o *prometheus.HistogramOpts) {
+		o.Buckets = opts.Buckets
+		o.NativeHistogramBucketFactor = opts.NativeHistogramBucketFactor
+		o.NativeHistogramZeroThreshold = opts.NativeHistogramZeroThreshold
+		o.NativeHistogramMaxBucketNumber = opts.NativeHistogramMaxBucketNumber
+		o.NativeHistogramMinResetDuration = opts.NativeHistogramMinResetDuration
+		o.NativeHistogramMaxZeroThreshold = opts.NativeHistogramMaxZeroThreshold
+	}
+}
+
+// WithHistogramConstLabels allows you to add custom ConstLabels to
+// histograms metrics.
+func WithHistogramConstLabels(labels prometheus.Labels) HistogramOption {
+	return func(o *prometheus.HistogramOpts) {
+		o.ConstLabels = labels
+	}
+}
+
+// WithHistogramSubsystem allows you to add a Subsystem to histograms metrics.
+func WithHistogramSubsystem(subsystem string) HistogramOption {
+	return func(o *prometheus.HistogramOpts) {
+		o.Subsystem = subsystem
+	}
+}
+
+func typeFromMethodInfo(mInfo *grpc.MethodInfo) grpcType {
+	if !mInfo.IsClientStream && !mInfo.IsServerStream {
+		return Unary
+	}
+	if mInfo.IsClientStream && !mInfo.IsServerStream {
+		return ClientStream
+	}
+	if !mInfo.IsClientStream && mInfo.IsServerStream {
+		return ServerStream
+	}
+	return BidiStream
+}
+
+// An Option lets you add options to prometheus interceptors using With* funcs.
+type Option func(*config)
+
+type config struct {
+	exemplarFn exemplarFromCtxFn
+}
+
+func (c *config) apply(opts []Option) {
+	for _, o := range opts {
+		o(c)
+	}
+}
+
+// WithExemplarFromContext sets function that will be used to deduce exemplar for all counter and histogram metrics.
+func WithExemplarFromContext(exemplarFn exemplarFromCtxFn) Option {
+	return func(o *config) {
+		o.exemplarFn = exemplarFn
+	}
+}