[exporter/clickhouse]: Add the ability to override default table name…

…s for all metric types (open-telemetry#34251)

**Description:** <Describe what has changed.>
- add the ability to override default table names for all metric types

**Link to tracking Issue:** open-telemetry#34225

**Testing:**
- unit tests

**Documentation:** <Describe the documentation added.>

---------

Signed-off-by: odubajDT <ondrej.dubaj@dynatrace.com>

.chloggen/metrics-tables-clickhouse.yaml

@@ -0,0 +1,28 @@
+# Use this changelog template to create an entry for release notes.
+
+# One of 'breaking', 'deprecation', 'new_component', 'enhancement', 'bug_fix'
+change_type: enhancement
+
+# The name of the component, or a single word describing the area of concern, (e.g. filelogreceiver)
+component: exporter/clickhouse
+
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: Add the ability to override default table names for all metric types.
+
+# Mandatory: One or more tracking issues related to the change. You can use the PR number here if no issue exists.
+issues: [34225]
+
+# (Optional) One or more lines of additional information to render under the primary note.
+# These lines will be padded with 2 spaces and then inserted directly into the document.
+# Use pipe (|) for multiline entries.
+subtext: |
+  'metrics_table_name' of the clickhouse exporter config is deprecated and newly introduced parameter 'metrics_tables' should be used instead.
+
+# If your change doesn't affect end users or the exported elements of any package,
+# you should instead start your pull request title with [chore] or use the "Skip Changelog" label.
+# Optional: The change log or logs in which this entry should be included.
+# e.g. '[user]' or '[user, api]'
+# Include 'user' if the change is relevant to end users.
+# Include 'api' if there is a change to a library API.
+# Default: '[user]'
+change_logs: []

exporter/clickhouseexporter/README.md

@@ -294,7 +294,17 @@ ClickHouse tables:
 
 - `logs_table_name` (default = otel_logs): The table name for logs.
 - `traces_table_name` (default = otel_traces): The table name for traces.
-- `metrics_table_name` (default = otel_metrics): The table name for metrics.
+- `metrics_tables`
+    - `gauge`
+        - `name` (default = "otel_metrics_gauge")
+    - `sum`
+        - `name` (default = "otel_metrics_sum")
+    - `summary`
+        - `name` (default = "otel_metrics_summary")
+    - `histogram`
+        - `name` (default = "otel_metrics_histogram")
+    - `exponential_histogram`
+        - `name` (default = "otel_metrics_exp_histogram")
 
 Cluster definition:
 
@@ -365,8 +375,18 @@ exporters:
     create_schema: true
     logs_table_name: otel_logs
     traces_table_name: otel_traces
-    metrics_table_name: otel_metrics
     timeout: 5s
+    metrics_tables:
+      gauge: 
+        name: "otel_metrics_gauge"
+      sum: 
+        name: "otel_metrics_sum"
+      summary: 
+        name: "otel_metrics_summary"
+      histogram: 
+        name: "otel_metrics_histogram"
+      exponential_histogram: 
+        name: "otel_metrics_exp_histogram"
     retry_on_failure:
       enabled: true
       initial_interval: 5s

exporter/clickhouseexporter/config.go

@@ -14,6 +14,8 @@ import (
 	"go.opentelemetry.io/collector/config/configopaque"
 	"go.opentelemetry.io/collector/config/configretry"
 	"go.opentelemetry.io/collector/exporter/exporterhelper"
+
+	"github.com/open-telemetry/opentelemetry-collector-contrib/exporter/clickhouseexporter/internal"
 )
 
 // Config defines configuration for Elastic exporter.
@@ -37,6 +39,10 @@ type Config struct {
 	// TracesTableName is the table name for traces. default is `otel_traces`.
 	TracesTableName string `mapstructure:"traces_table_name"`
 	// MetricsTableName is the table name for metrics. default is `otel_metrics`.
+	//
+	// Deprecated: MetricsTableName exists for historical compatibility
+	// and should not be used. To set the metrics tables name,
+	// use the MetricsTables parameter instead.
 	MetricsTableName string `mapstructure:"metrics_table_name"`
 	// TTL is The data time-to-live example 30m, 48h. 0 means no ttl.
 	TTL time.Duration `mapstructure:"ttl"`
@@ -52,6 +58,21 @@ type Config struct {
 	// Ignored if async inserts are configured in the `endpoint` or `connection_params`.
 	// Async inserts may still be overridden server-side.
 	AsyncInsert bool `mapstructure:"async_insert"`
+	// MetricsTables defines the table names for metric types.
+	MetricsTables MetricTablesConfig `mapstructure:"metrics_tables"`
+}
+
+type MetricTablesConfig struct {
+	// Gauge is the table name for gauge metric type. default is `otel_metrics_gauge`.
+	Gauge internal.MetricTypeConfig `mapstructure:"gauge"`
+	// Sum is the table name for sum metric type. default is `otel_metrics_sum`.
+	Sum internal.MetricTypeConfig `mapstructure:"sum"`
+	// Summary is the table name for summary metric type. default is `otel_metrics_summary`.
+	Summary internal.MetricTypeConfig `mapstructure:"summary"`
+	// Histogram is the table name for histogram metric type. default is `otel_metrics_histogram`.
+	Histogram internal.MetricTypeConfig `mapstructure:"histogram"`
+	// ExponentialHistogram is the table name for exponential histogram metric type. default is `otel_metrics_exponential_histogram`.
+	ExponentialHistogram internal.MetricTypeConfig `mapstructure:"exponential_histogram"`
 }
 
 // TableEngine defines the ENGINE string value when creating the table.
@@ -62,6 +83,12 @@ type TableEngine struct {
 
 const defaultDatabase = "default"
 const defaultTableEngineName = "MergeTree"
+const defaultMetricTableName = "otel_metrics"
+const defaultGaugeSuffix = "_gauge"
+const defaultSumSuffix = "_sum"
+const defaultSummarySuffix = "_summary"
+const defaultHistogramSuffix = "_histogram"
+const defaultExpHistogramSuffix = "_exponential_histogram"
 
 var (
 	errConfigNoEndpoint      = errors.New("endpoint must be specified")
@@ -78,6 +105,8 @@ func (cfg *Config) Validate() (err error) {
 		err = errors.Join(err, e)
 	}
 
+	cfg.buildMetricTableNames()
+
 	// Validate DSN with clickhouse driver.
 	// Last chance to catch invalid config.
 	if _, e := clickhouse.ParseDSN(dsn); e != nil {
@@ -153,6 +182,38 @@ func (cfg *Config) shouldCreateSchema() bool {
 	return cfg.CreateSchema
 }
 
+func (cfg *Config) buildMetricTableNames() {
+	tableName := defaultMetricTableName
+
+	if len(cfg.MetricsTableName) != 0 && !cfg.areMetricTableNamesSet() {
+		tableName = cfg.MetricsTableName
+	}
+
+	if len(cfg.MetricsTables.Gauge.Name) == 0 {
+		cfg.MetricsTables.Gauge.Name = tableName + defaultGaugeSuffix
+	}
+	if len(cfg.MetricsTables.Sum.Name) == 0 {
+		cfg.MetricsTables.Sum.Name = tableName + defaultSumSuffix
+	}
+	if len(cfg.MetricsTables.Summary.Name) == 0 {
+		cfg.MetricsTables.Summary.Name = tableName + defaultSummarySuffix
+	}
+	if len(cfg.MetricsTables.Histogram.Name) == 0 {
+		cfg.MetricsTables.Histogram.Name = tableName + defaultHistogramSuffix
+	}
+	if len(cfg.MetricsTables.ExponentialHistogram.Name) == 0 {
+		cfg.MetricsTables.ExponentialHistogram.Name = tableName + defaultExpHistogramSuffix
+	}
+}
+
+func (cfg *Config) areMetricTableNamesSet() bool {
+	return len(cfg.MetricsTables.Gauge.Name) != 0 ||
+		len(cfg.MetricsTables.Sum.Name) != 0 ||
+		len(cfg.MetricsTables.Summary.Name) != 0 ||
+		len(cfg.MetricsTables.Histogram.Name) != 0 ||
+		len(cfg.MetricsTables.ExponentialHistogram.Name) != 0
+}
+
 // tableEngineString generates the ENGINE string.
 func (cfg *Config) tableEngineString() string {
 	engine := cfg.TableEngine.Name

exporter/clickhouseexporter/config_test.go

@@ -19,6 +19,7 @@ import (
 	"go.opentelemetry.io/collector/confmap/confmaptest"
 	"go.opentelemetry.io/collector/exporter/exporterhelper"
 
+	"github.com/open-telemetry/opentelemetry-collector-contrib/exporter/clickhouseexporter/internal"
 	"github.com/open-telemetry/opentelemetry-collector-contrib/exporter/clickhouseexporter/internal/metadata"
 )
 
@@ -47,15 +48,14 @@ func TestLoadConfig(t *testing.T) {
 		{
 			id: component.NewIDWithName(metadata.Type, "full"),
 			expected: &Config{
-				Endpoint:         defaultEndpoint,
-				Database:         "otel",
-				Username:         "foo",
-				Password:         "bar",
-				TTL:              72 * time.Hour,
-				LogsTableName:    "otel_logs",
-				TracesTableName:  "otel_traces",
-				MetricsTableName: "otel_metrics",
-				CreateSchema:     true,
+				Endpoint:        defaultEndpoint,
+				Database:        "otel",
+				Username:        "foo",
+				Password:        "bar",
+				TTL:             72 * time.Hour,
+				LogsTableName:   "otel_logs",
+				TracesTableName: "otel_traces",
+				CreateSchema:    true,
 				TimeoutSettings: exporterhelper.TimeoutConfig{
 					Timeout: 5 * time.Second,
 				},
@@ -67,6 +67,13 @@ func TestLoadConfig(t *testing.T) {
 					RandomizationFactor: backoff.DefaultRandomizationFactor,
 					Multiplier:          backoff.DefaultMultiplier,
 				},
+				MetricsTables: MetricTablesConfig{
+					Gauge:                internal.MetricTypeConfig{Name: "otel_metrics_custom_gauge"},
+					Sum:                  internal.MetricTypeConfig{Name: "otel_metrics_custom_sum"},
+					Summary:              internal.MetricTypeConfig{Name: "otel_metrics_custom_summary"},
+					Histogram:            internal.MetricTypeConfig{Name: "otel_metrics_custom_histogram"},
+					ExponentialHistogram: internal.MetricTypeConfig{Name: "otel_metrics_custom_exp_histogram"},
+				},
 				ConnectionParams: map[string]string{},
 				QueueSettings: exporterhelper.QueueConfig{
 					Enabled:      true,
@@ -102,6 +109,123 @@ func withDefaultConfig(fns ...func(*Config)) *Config {
 	return cfg
 }
 
+func TestBuildMetricMetricTableNames(t *testing.T) {
+	tests := []struct {
+		name string
+		cfg  Config
+		want Config
+	}{
+		{
+			name: "nothing set",
+			cfg:  Config{},
+			want: Config{
+				MetricsTables: MetricTablesConfig{
+					Gauge:                internal.MetricTypeConfig{Name: "otel_metrics_gauge"},
+					Sum:                  internal.MetricTypeConfig{Name: "otel_metrics_sum"},
+					Summary:              internal.MetricTypeConfig{Name: "otel_metrics_summary"},
+					Histogram:            internal.MetricTypeConfig{Name: "otel_metrics_histogram"},
+					ExponentialHistogram: internal.MetricTypeConfig{Name: "otel_metrics_exponential_histogram"},
+				},
+			},
+		},
+		{
+			name: "only metric_table_name set",
+			cfg: Config{
+				MetricsTableName: "table_name",
+			},
+			want: Config{
+				MetricsTableName: "table_name",
+				MetricsTables: MetricTablesConfig{
+					Gauge:                internal.MetricTypeConfig{Name: "table_name_gauge"},
+					Sum:                  internal.MetricTypeConfig{Name: "table_name_sum"},
+					Summary:              internal.MetricTypeConfig{Name: "table_name_summary"},
+					Histogram:            internal.MetricTypeConfig{Name: "table_name_histogram"},
+					ExponentialHistogram: internal.MetricTypeConfig{Name: "table_name_exponential_histogram"},
+				},
+			},
+		},
+		{
+			name: "only metric_tables set fully",
+			cfg: Config{
+				MetricsTables: MetricTablesConfig{
+					Gauge:                internal.MetricTypeConfig{Name: "table_name_gauge"},
+					Sum:                  internal.MetricTypeConfig{Name: "table_name_sum"},
+					Summary:              internal.MetricTypeConfig{Name: "table_name_summary"},
+					Histogram:            internal.MetricTypeConfig{Name: "table_name_histogram"},
+					ExponentialHistogram: internal.MetricTypeConfig{Name: "table_name_exponential_histogram"},
+				},
+			},
+			want: Config{
+				MetricsTables: MetricTablesConfig{
+					Gauge:                internal.MetricTypeConfig{Name: "table_name_gauge"},
+					Sum:                  internal.MetricTypeConfig{Name: "table_name_sum"},
+					Summary:              internal.MetricTypeConfig{Name: "table_name_summary"},
+					Histogram:            internal.MetricTypeConfig{Name: "table_name_histogram"},
+					ExponentialHistogram: internal.MetricTypeConfig{Name: "table_name_exponential_histogram"},
+				},
+			},
+		},
+		{
+			name: "only metric_tables set partially",
+			cfg: Config{
+				MetricsTables: MetricTablesConfig{
+					Summary:              internal.MetricTypeConfig{Name: "table_name_summary"},
+					Histogram:            internal.MetricTypeConfig{Name: "table_name_histogram"},
+					ExponentialHistogram: internal.MetricTypeConfig{Name: "table_name_exp_histogram"},
+				},
+			},
+			want: Config{
+				MetricsTables: MetricTablesConfig{
+					Gauge:                internal.MetricTypeConfig{Name: "otel_metrics_gauge"},
+					Sum:                  internal.MetricTypeConfig{Name: "otel_metrics_sum"},
+					Summary:              internal.MetricTypeConfig{Name: "table_name_summary"},
+					Histogram:            internal.MetricTypeConfig{Name: "table_name_histogram"},
+					ExponentialHistogram: internal.MetricTypeConfig{Name: "table_name_exp_histogram"},
+				},
+			},
+		},
+		{
+			name: "only metric_tables set partially with metric_table_name",
+			cfg: Config{
+				MetricsTableName: "custom_name",
+				MetricsTables: MetricTablesConfig{
+					Summary:              internal.MetricTypeConfig{Name: "table_name_summary"},
+					Histogram:            internal.MetricTypeConfig{Name: "table_name_histogram"},
+					ExponentialHistogram: internal.MetricTypeConfig{Name: "table_name_exp_histogram"},
+				},
+			},
+			want: Config{
+				MetricsTableName: "custom_name",
+				MetricsTables: MetricTablesConfig{
+					Gauge:                internal.MetricTypeConfig{Name: "otel_metrics_gauge"},
+					Sum:                  internal.MetricTypeConfig{Name: "otel_metrics_sum"},
+					Summary:              internal.MetricTypeConfig{Name: "table_name_summary"},
+					Histogram:            internal.MetricTypeConfig{Name: "table_name_histogram"},
+					ExponentialHistogram: internal.MetricTypeConfig{Name: "table_name_exp_histogram"},
+				},
+			},
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			tt.cfg.buildMetricTableNames()
+			require.Equal(t, tt.want, tt.cfg)
+		})
+	}
+}
+
+func TestAreMetricTableNamesSet(t *testing.T) {
+	cfg := Config{}
+	require.False(t, cfg.areMetricTableNamesSet())
+
+	cfg = Config{
+		MetricsTables: MetricTablesConfig{
+			Gauge: internal.MetricTypeConfig{Name: "gauge"},
+		},
+	}
+	require.True(t, cfg.areMetricTableNamesSet())
+}
+
 func TestConfig_buildDSN(t *testing.T) {
 	type fields struct {
 		Endpoint         string

exporter/clickhouseexporter/exporter_metrics.go

@@ -19,8 +19,9 @@ import (
 type metricsExporter struct {
 	client *sql.DB
 
-	logger *zap.Logger
-	cfg    *Config
+	logger       *zap.Logger
+	cfg          *Config
+	tablesConfig internal.MetricTablesConfigMapper
 }
 
 func newMetricsExporter(logger *zap.Logger, cfg *Config) (*metricsExporter, error) {
@@ -29,10 +30,13 @@ func newMetricsExporter(logger *zap.Logger, cfg *Config) (*metricsExporter, erro
 		return nil, err
 	}
 
+	tablesConfig := generateMetricTablesConfigMapper(cfg)
+
 	return &metricsExporter{
-		client: client,
-		logger: logger,
-		cfg:    cfg,
+		client:       client,
+		logger:       logger,
+		cfg:          cfg,
+		tablesConfig: tablesConfig,
 	}, nil
 }
 
@@ -48,7 +52,17 @@ func (e *metricsExporter) start(ctx context.Context, _ component.Host) error {
 	}
 
 	ttlExpr := generateTTLExpr(e.cfg.TTL, "toDateTime(TimeUnix)")
-	return internal.NewMetricsTable(ctx, e.cfg.MetricsTableName, e.cfg.clusterString(), e.cfg.tableEngineString(), ttlExpr, e.client)
+	return internal.NewMetricsTable(ctx, e.tablesConfig, e.cfg.clusterString(), e.cfg.tableEngineString(), ttlExpr, e.client)
+}
+
+func generateMetricTablesConfigMapper(cfg *Config) internal.MetricTablesConfigMapper {
+	return internal.MetricTablesConfigMapper{
+		pmetric.MetricTypeGauge:                cfg.MetricsTables.Gauge,
+		pmetric.MetricTypeSum:                  cfg.MetricsTables.Sum,
+		pmetric.MetricTypeSummary:              cfg.MetricsTables.Summary,
+		pmetric.MetricTypeHistogram:            cfg.MetricsTables.Histogram,
+		pmetric.MetricTypeExponentialHistogram: cfg.MetricsTables.ExponentialHistogram,
+	}
 }
 
 // shutdown will shut down the exporter.
@@ -60,7 +74,7 @@ func (e *metricsExporter) shutdown(_ context.Context) error {
 }
 
 func (e *metricsExporter) pushMetricsData(ctx context.Context, md pmetric.Metrics) error {
-	metricsMap := internal.NewMetricsModel(e.cfg.MetricsTableName)
+	metricsMap := internal.NewMetricsModel(e.tablesConfig)
 	for i := 0; i < md.ResourceMetrics().Len(); i++ {
 		metrics := md.ResourceMetrics().At(i)
 		resAttr := attributesToMap(metrics.Resource().Attributes())