Cleanup the Prometheus config (#5720)

## Which problem is this PR solving?
- Part of #5632

## Description of the changes
- Cleaned up the Prometheus config
- Removed namespaceConfig as its not needed for a metrics storage

## How was this change tested?
- `make test`

## Checklist
- [x] I have read
https://github.com/jaegertracing/jaeger/blob/master/CONTRIBUTING_GUIDELINES.md
- [x] I have signed all commits
<s> - [ ] I have added unit tests for the new functionality </s>
- [x] I have run lint and test steps successfully
  - for `jaeger`: `make lint test`
  - for `jaeger-ui`: `yarn lint` and `yarn test`

---------

Signed-off-by: FlamingSaint <[email protected]>

pkg/version/build_test.go

@@ -43,4 +43,4 @@ func TestString(t *testing.T) {
 	}
 	expectedOutput := "git-commit=foobar, git-version=v1.2.3, build-date=2024-01-04"
 	assert.Equal(t, expectedOutput, test.String())
-}
+}

plugin/metrics/prometheus/factory.go

@@ -40,7 +40,7 @@ type Factory struct {
 func NewFactory() *Factory {
 	return &Factory{
 		tracer:  otel.GetTracerProvider(),
-		options: NewOptions("prometheus"),
+		options: NewOptions(),
 	}
 }
 
@@ -64,5 +64,5 @@ func (f *Factory) Initialize(logger *zap.Logger) error {
 
 // CreateMetricsReader implements storage.MetricsFactory.
 func (f *Factory) CreateMetricsReader() (metricsstore.Reader, error) {
-	return prometheusstore.NewMetricsReader(f.options.Primary.Configuration, f.logger, f.tracer)
+	return prometheusstore.NewMetricsReader(f.options.Configuration, f.logger, f.tracer)
 }

plugin/metrics/prometheus/factory_test.go

@@ -34,14 +34,13 @@ func TestPrometheusFactory(t *testing.T) {
 	f := NewFactory()
 	require.NoError(t, f.Initialize(zap.NewNop()))
 	assert.NotNil(t, f.logger)
-	assert.Equal(t, "prometheus", f.options.Primary.namespace)
 
 	listener, err := net.Listen("tcp", "localhost:")
 	require.NoError(t, err)
 	assert.NotNil(t, listener)
 	defer listener.Close()
 
-	f.options.Primary.ServerURL = "http://" + listener.Addr().String()
+	f.options.ServerURL = "http://" + listener.Addr().String()
 	reader, err := f.CreateMetricsReader()
 
 	require.NoError(t, err)
@@ -50,11 +49,11 @@ func TestPrometheusFactory(t *testing.T) {
 
 func TestWithDefaultConfiguration(t *testing.T) {
 	f := NewFactory()
-	assert.Equal(t, "http://localhost:9090", f.options.Primary.ServerURL)
-	assert.Equal(t, 30*time.Second, f.options.Primary.ConnectTimeout)
+	assert.Equal(t, "http://localhost:9090", f.options.ServerURL)
+	assert.Equal(t, 30*time.Second, f.options.ConnectTimeout)
 
-	assert.Empty(t, f.options.Primary.MetricNamespace)
-	assert.Equal(t, "ms", f.options.Primary.LatencyUnit)
+	assert.Empty(t, f.options.MetricNamespace)
+	assert.Equal(t, "ms", f.options.LatencyUnit)
 }
 
 func TestWithConfiguration(t *testing.T) {
@@ -69,10 +68,10 @@ func TestWithConfiguration(t *testing.T) {
 		})
 		require.NoError(t, err)
 		f.InitFromViper(v, zap.NewNop())
-		assert.Equal(t, "http://localhost:1234", f.options.Primary.ServerURL)
-		assert.Equal(t, 5*time.Second, f.options.Primary.ConnectTimeout)
-		assert.Equal(t, "test/test_file.txt", f.options.Primary.TokenFilePath)
-		assert.False(t, f.options.Primary.TokenOverrideFromContext)
+		assert.Equal(t, "http://localhost:1234", f.options.ServerURL)
+		assert.Equal(t, 5*time.Second, f.options.ConnectTimeout)
+		assert.Equal(t, "test/test_file.txt", f.options.TokenFilePath)
+		assert.False(t, f.options.TokenOverrideFromContext)
 	})
 	t.Run("with space in token file path", func(t *testing.T) {
 		f := NewFactory()
@@ -82,7 +81,7 @@ func TestWithConfiguration(t *testing.T) {
 		})
 		require.NoError(t, err)
 		f.InitFromViper(v, zap.NewNop())
-		assert.Equal(t, "test/ test file.txt", f.options.Primary.TokenFilePath)
+		assert.Equal(t, "test/ test file.txt", f.options.TokenFilePath)
 	})
 	t.Run("with custom configuration of prometheus.query", func(t *testing.T) {
 		f := NewFactory()
@@ -93,8 +92,8 @@ func TestWithConfiguration(t *testing.T) {
 		})
 		require.NoError(t, err)
 		f.InitFromViper(v, zap.NewNop())
-		assert.Equal(t, "mynamespace", f.options.Primary.MetricNamespace)
-		assert.Equal(t, "ms", f.options.Primary.LatencyUnit)
+		assert.Equal(t, "mynamespace", f.options.MetricNamespace)
+		assert.Equal(t, "ms", f.options.LatencyUnit)
 	})
 	t.Run("with invalid prometheus.query.duration-unit", func(t *testing.T) {
 		defer func() {
@@ -110,7 +109,7 @@ func TestWithConfiguration(t *testing.T) {
 		})
 		require.NoError(t, err)
 		f.InitFromViper(v, zap.NewNop())
-		require.Empty(t, f.options.Primary.LatencyUnit)
+		require.Empty(t, f.options.LatencyUnit)
 	})
 }
 

plugin/metrics/prometheus/options.go

@@ -27,6 +27,8 @@ import (
 )
 
 const (
+	prefix = "prometheus"
+
 	suffixServerURL           = ".server-url"
 	suffixConnectTimeout      = ".connect-timeout"
 	suffixTokenFilePath       = ".token-file"
@@ -48,18 +50,13 @@ const (
 	defaultNormalizeDuration           = false
 )
 
-type namespaceConfig struct {
-	config.Configuration `mapstructure:",squash"`
-	namespace            string
-}
-
 // Options stores the configuration entries for this storage.
 type Options struct {
-	Primary namespaceConfig `mapstructure:",squash"`
+	config.Configuration `mapstructure:",squash"`
 }
 
 // NewOptions creates a new Options struct.
-func NewOptions(primaryNamespace string) *Options {
+func NewOptions() *Options {
 	defaultConfig := config.Configuration{
 		ServerURL:      defaultServerURL,
 		ConnectTimeout: defaultConnectTimeout,
@@ -71,75 +68,70 @@ func NewOptions(primaryNamespace string) *Options {
 	}
 
 	return &Options{
-		Primary: namespaceConfig{
-			Configuration: defaultConfig,
-			namespace:     primaryNamespace,
-		},
+		Configuration: defaultConfig,
 	}
 }
 
 // AddFlags from this storage to the CLI.
 func (opt *Options) AddFlags(flagSet *flag.FlagSet) {
-	nsConfig := &opt.Primary
-	flagSet.String(nsConfig.namespace+suffixServerURL, defaultServerURL,
+	flagSet.String(prefix+suffixServerURL, defaultServerURL,
 		"The Prometheus server's URL, must include the protocol scheme e.g. http://localhost:9090")
-	flagSet.Duration(nsConfig.namespace+suffixConnectTimeout, defaultConnectTimeout,
+	flagSet.Duration(prefix+suffixConnectTimeout, defaultConnectTimeout,
 		"The period to wait for a connection to Prometheus when executing queries.")
-	flagSet.String(nsConfig.namespace+suffixTokenFilePath, defaultTokenFilePath,
+	flagSet.String(prefix+suffixTokenFilePath, defaultTokenFilePath,
 		"The path to a file containing the bearer token which will be included when executing queries against the Prometheus API.")
-	flagSet.Bool(nsConfig.namespace+suffixOverrideFromContext, true,
+	flagSet.Bool(prefix+suffixOverrideFromContext, true,
 		"Whether the bearer token should be overridden from context (incoming request)")
-	flagSet.String(nsConfig.namespace+suffixMetricNamespace, defaultMetricNamespace,
+	flagSet.String(prefix+suffixMetricNamespace, defaultMetricNamespace,
 		`The metric namespace that is prefixed to the metric name. A '.' separator will be added between `+
 			`the namespace and the metric name.`)
-	flagSet.String(nsConfig.namespace+suffixLatencyUnit, defaultLatencyUnit,
+	flagSet.String(prefix+suffixLatencyUnit, defaultLatencyUnit,
 		`The units used for the "latency" histogram. It can be either "ms" or "s" and should be consistent with the `+
 			`histogram unit value set in the spanmetrics connector (see: `+
 			`https://github.com/open-telemetry/opentelemetry-collector-contrib/tree/main/connector/spanmetricsconnector#configurations). `+
 			`This also helps jaeger-query determine the metric name when querying for "latency" metrics.`)
-	flagSet.Bool(nsConfig.namespace+suffixNormalizeCalls, defaultNormalizeCalls,
+	flagSet.Bool(prefix+suffixNormalizeCalls, defaultNormalizeCalls,
 		`Whether to normalize the "calls" metric name according to `+
 			`https://github.com/open-telemetry/opentelemetry-collector-contrib/blob/main/pkg/translator/prometheus/README.md. `+
 			`For example: `+
 			`"calls" (not normalized) -> "calls_total" (normalized), `)
-	flagSet.Bool(nsConfig.namespace+suffixNormalizeDuration, defaultNormalizeDuration,
+	flagSet.Bool(prefix+suffixNormalizeDuration, defaultNormalizeDuration,
 		`Whether to normalize the "duration" metric name according to `+
 			`https://github.com/open-telemetry/opentelemetry-collector-contrib/blob/main/pkg/translator/prometheus/README.md. `+
 			`For example: `+
 			`"duration_bucket" (not normalized) -> "duration_milliseconds_bucket (normalized)"`)
 
-	nsConfig.getTLSFlagsConfig().AddFlags(flagSet)
+	opt.getTLSFlagsConfig().AddFlags(flagSet)
 }
 
 // InitFromViper initializes the options struct with values from Viper.
 func (opt *Options) InitFromViper(v *viper.Viper) error {
-	cfg := &opt.Primary
-	cfg.ServerURL = stripWhiteSpace(v.GetString(cfg.namespace + suffixServerURL))
-	cfg.ConnectTimeout = v.GetDuration(cfg.namespace + suffixConnectTimeout)
-	cfg.TokenFilePath = v.GetString(cfg.namespace + suffixTokenFilePath)
+	opt.ServerURL = stripWhiteSpace(v.GetString(prefix + suffixServerURL))
+	opt.ConnectTimeout = v.GetDuration(prefix + suffixConnectTimeout)
+	opt.TokenFilePath = v.GetString(prefix + suffixTokenFilePath)
 
-	cfg.MetricNamespace = v.GetString(cfg.namespace + suffixMetricNamespace)
-	cfg.LatencyUnit = v.GetString(cfg.namespace + suffixLatencyUnit)
-	cfg.NormalizeCalls = v.GetBool(cfg.namespace + suffixNormalizeCalls)
-	cfg.NormalizeDuration = v.GetBool(cfg.namespace + suffixNormalizeDuration)
-	cfg.TokenOverrideFromContext = v.GetBool(cfg.namespace + suffixOverrideFromContext)
+	opt.MetricNamespace = v.GetString(prefix + suffixMetricNamespace)
+	opt.LatencyUnit = v.GetString(prefix + suffixLatencyUnit)
+	opt.NormalizeCalls = v.GetBool(prefix + suffixNormalizeCalls)
+	opt.NormalizeDuration = v.GetBool(prefix + suffixNormalizeDuration)
+	opt.TokenOverrideFromContext = v.GetBool(prefix + suffixOverrideFromContext)
 
 	isValidUnit := map[string]bool{"ms": true, "s": true}
-	if _, ok := isValidUnit[cfg.LatencyUnit]; !ok {
-		return fmt.Errorf(`duration-unit must be one of "ms" or "s", not %q`, cfg.LatencyUnit)
+	if _, ok := isValidUnit[opt.LatencyUnit]; !ok {
+		return fmt.Errorf(`duration-unit must be one of "ms" or "s", not %q`, opt.LatencyUnit)
 	}
 
 	var err error
-	cfg.TLS, err = cfg.getTLSFlagsConfig().InitFromViper(v)
+	opt.TLS, err = opt.getTLSFlagsConfig().InitFromViper(v)
 	if err != nil {
 		return fmt.Errorf("failed to process Prometheus TLS options: %w", err)
 	}
 	return nil
 }
 
-func (config *namespaceConfig) getTLSFlagsConfig() tlscfg.ClientFlagsConfig {
+func (*Options) getTLSFlagsConfig() tlscfg.ClientFlagsConfig {
 	return tlscfg.ClientFlagsConfig{
-		Prefix: config.namespace,
+		Prefix: prefix,
 	}
 }