sqltelemetry,sql: Add telemetry for partitioning related improvements

This PR adds telemetry for the ALTER PARTITION FROM INDEX t@* command,
as well as sets up some boilerplate code for adding more partitioning
specific telemetry counters.

Work for https://github.com/cockroachlabs/registration/issues/228.

Release justification: Low risk monitoring improvement.

Release note: None

pkg/ccl/logictestccl/testdata/logic_test/zone

@@ -638,6 +638,11 @@ CREATE INDEX x2 ON t2 (x) PARTITION BY LIST (x) (
 statement ok
 ALTER PARTITION p1 OF INDEX t2@* CONFIGURE ZONE USING num_replicas = 1
 
+query T
+SELECT feature_name FROM crdb_internal.feature_usage WHERE feature_name='sql.partitioning.alter-all-partitions' AND usage_count > 0
+----
+sql.partitioning.alter-all-partitions
+
 statement error index "t2" does not exist\nHINT: try specifying the index as <tablename>@<indexname>
 ALTER PARTITION p1 OF INDEX t2 CONFIGURE ZONE USING num_replicas = 1
 

pkg/sql/set_zone_config.go

@@ -24,6 +24,7 @@ import (
 	"github.com/cockroachdb/cockroach/pkg/sql/pgwire/pgerror"
 	"github.com/cockroachdb/cockroach/pkg/sql/sem/tree"
 	"github.com/cockroachdb/cockroach/pkg/sql/sqlbase"
+	"github.com/cockroachdb/cockroach/pkg/sql/sqltelemetry"
 	"github.com/cockroachdb/cockroach/pkg/sql/types"
 	"github.com/cockroachdb/cockroach/pkg/util/protoutil"
 	"github.com/cockroachdb/errors"
@@ -270,6 +271,7 @@ func (n *setZoneConfigNode) startExec(params runParams) error {
 	// of them.
 	var specifiers []tree.ZoneSpecifier
 	if n.zoneSpecifier.TargetsPartition() && n.allIndexes {
+		sqltelemetry.IncrementPartitioningCounter(sqltelemetry.AlterAllPartitions)
 		for _, idx := range table.AllNonDropIndexes() {
 			if p := idx.FindPartitionByName(string(n.zoneSpecifier.Partition)); p != nil {
 				zs := n.zoneSpecifier

pkg/sql/sqltelemetry/partitioning.go

@@ -0,0 +1,49 @@
+// Copyright 2019 The Cockroach Authors.
+//
+// Use of this software is governed by the Business Source License
+// included in the file licenses/BSL.txt.
+//
+// As of the Change Date specified in that file, in accordance with
+// the Business Source License, use of this software will be governed
+// by the Apache License, Version 2.0, included in the file
+// licenses/APL.txt.
+
+package sqltelemetry
+
+import (
+	"fmt"
+
+	"github.com/cockroachdb/cockroach/pkg/server/telemetry"
+)
+
+// PartitioningTelemetryType is an enum used to represent the different partitioning related operations
+// that we are recording telemetry for.
+type PartitioningTelemetryType int
+
+const (
+	_ PartitioningTelemetryType = iota
+	// AlterAllPartitions represents an ALTER ALL PARTITIONS statement (ALTER PARTITION OF INDEX t@*)
+	AlterAllPartitions
+)
+
+var partitioningTelemetryMap = map[PartitioningTelemetryType]string{
+	AlterAllPartitions: "alter-all-partitions",
+}
+
+func (p PartitioningTelemetryType) String() string {
+	return partitioningTelemetryMap[p]
+}
+
+var partitioningTelemetryCounters map[PartitioningTelemetryType]telemetry.Counter
+
+func init() {
+	partitioningTelemetryCounters = make(map[PartitioningTelemetryType]telemetry.Counter)
+	for ty, s := range partitioningTelemetryMap {
+		partitioningTelemetryCounters[ty] = telemetry.GetCounterOnce(fmt.Sprintf("sql.partitioning.%s", s))
+	}
+}
+
+// IncrementPartitioningCounter is used to increment the telemetry counter for a particular partitioning operation.
+func IncrementPartitioningCounter(partitioningType PartitioningTelemetryType) {
+	telemetry.Inc(partitioningTelemetryCounters[partitioningType])
+}