Bump github.com/uber/jaeger-client-go

Bumps [github.com/uber/jaeger-client-go](https://github.com/uber/jaeger-client-go) from 2.19.0+incompatible to 2.20.0+incompatible.
- [Release notes](https://github.com/uber/jaeger-client-go/releases)
- [Changelog](https://github.com/jaegertracing/jaeger-client-go/blob/master/CHANGELOG.md)
- [Commits](https://github.com/uber/jaeger-client-go/compare/v2.19.0...v2.20.0)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>
Signed-off-by: Valentin Rothberg <rothberg@redhat.com>

vendor/github.com/uber/jaeger-client-go/sampler_remote_options.go

@@ -0,0 +1,148 @@
+// Copyright (c) 2017 Uber Technologies, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package jaeger
+
+import (
+	"time"
+
+	"github.com/uber/jaeger-client-go/log"
+)
+
+// SamplerOption is a function that sets some option on the sampler
+type SamplerOption func(options *samplerOptions)
+
+// SamplerOptions is a factory for all available SamplerOption's
+var SamplerOptions samplerOptions
+
+type samplerOptions struct {
+	metrics                 *Metrics
+	maxOperations           int
+	sampler                 SamplerV2
+	logger                  Logger
+	samplingServerURL       string
+	samplingRefreshInterval time.Duration
+	samplingFetcher         SamplingStrategyFetcher
+	samplingParser          SamplingStrategyParser
+	updaters                []SamplerUpdater
+}
+
+// Metrics creates a SamplerOption that initializes Metrics on the sampler,
+// which is used to emit statistics.
+func (samplerOptions) Metrics(m *Metrics) SamplerOption {
+	return func(o *samplerOptions) {
+		o.metrics = m
+	}
+}
+
+// MaxOperations creates a SamplerOption that sets the maximum number of
+// operations the sampler will keep track of.
+func (samplerOptions) MaxOperations(maxOperations int) SamplerOption {
+	return func(o *samplerOptions) {
+		o.maxOperations = maxOperations
+	}
+}
+
+// InitialSampler creates a SamplerOption that sets the initial sampler
+// to use before a remote sampler is created and used.
+func (samplerOptions) InitialSampler(sampler Sampler) SamplerOption {
+	return func(o *samplerOptions) {
+		o.sampler = samplerV1toV2(sampler)
+	}
+}
+
+// Logger creates a SamplerOption that sets the logger used by the sampler.
+func (samplerOptions) Logger(logger Logger) SamplerOption {
+	return func(o *samplerOptions) {
+		o.logger = logger
+	}
+}
+
+// SamplingServerURL creates a SamplerOption that sets the sampling server url
+// of the local agent that contains the sampling strategies.
+func (samplerOptions) SamplingServerURL(samplingServerURL string) SamplerOption {
+	return func(o *samplerOptions) {
+		o.samplingServerURL = samplingServerURL
+	}
+}
+
+// SamplingRefreshInterval creates a SamplerOption that sets how often the
+// sampler will poll local agent for the appropriate sampling strategy.
+func (samplerOptions) SamplingRefreshInterval(samplingRefreshInterval time.Duration) SamplerOption {
+	return func(o *samplerOptions) {
+		o.samplingRefreshInterval = samplingRefreshInterval
+	}
+}
+
+// SamplingStrategyFetcher creates a SamplerOption that initializes sampling strategy fetcher.
+func (samplerOptions) SamplingStrategyFetcher(fetcher SamplingStrategyFetcher) SamplerOption {
+	return func(o *samplerOptions) {
+		o.samplingFetcher = fetcher
+	}
+}
+
+// SamplingStrategyParser creates a SamplerOption that initializes sampling strategy parser.
+func (samplerOptions) SamplingStrategyParser(parser SamplingStrategyParser) SamplerOption {
+	return func(o *samplerOptions) {
+		o.samplingParser = parser
+	}
+}
+
+// Updaters creates a SamplerOption that initializes sampler updaters.
+func (samplerOptions) Updaters(updaters ...SamplerUpdater) SamplerOption {
+	return func(o *samplerOptions) {
+		o.updaters = updaters
+	}
+}
+
+func (o *samplerOptions) applyOptionsAndDefaults(opts ...SamplerOption) *samplerOptions {
+	for _, option := range opts {
+		option(o)
+	}
+	if o.sampler == nil {
+		o.sampler = newProbabilisticSampler(0.001)
+	}
+	if o.logger == nil {
+		o.logger = log.NullLogger
+	}
+	if o.maxOperations <= 0 {
+		o.maxOperations = defaultMaxOperations
+	}
+	if o.samplingServerURL == "" {
+		o.samplingServerURL = DefaultSamplingServerURL
+	}
+	if o.metrics == nil {
+		o.metrics = NewNullMetrics()
+	}
+	if o.samplingRefreshInterval <= 0 {
+		o.samplingRefreshInterval = defaultSamplingRefreshInterval
+	}
+	if o.samplingFetcher == nil {
+		o.samplingFetcher = &httpSamplingStrategyFetcher{
+			serverURL: o.samplingServerURL,
+			logger:    o.logger,
+		}
+	}
+	if o.samplingParser == nil {
+		o.samplingParser = new(samplingStrategyParser)
+	}
+	if o.updaters == nil {
+		o.updaters = []SamplerUpdater{
+			&AdaptiveSamplerUpdater{MaxOperations: o.maxOperations},
+			new(ProbabilisticSamplerUpdater),
+			new(RateLimitingSamplerUpdater),
+		}
+	}
+	return o
+}