Debug vars: Expose build version in /debug/vars (vitessio#14713)

Signed-off-by: Tyler Coleman <tyler@planetscale.com>

Author: tycol7

changelog/19.0/19.0.0/summary.md

@@ -10,6 +10,7 @@
     - [New MySQL Image](#mysql-image)
   - **[New Stats](#new-stats)**
     - [Stream Consolidations](#stream-consolidations)
+    - [Build Version in `/debug/vars`](#build-version-in-debug-vars)
   - **[VTGate](#vtgate)**
     - [`FOREIGN_KEY_CHECKS` is now a Vitess Aware Variable](#fk-checks-vitess-aware)
   - **[Vttestserver](#vttestserver)**
@@ -53,6 +54,10 @@ Several tags are available to let you choose what version of MySQL you want to u
 
 Prior to 19.0 VTTablet reported how much time non-streaming executions spend waiting for consolidations to occur. In 19.0, VTTablet reports a similar stat for streaming executions in `/debug/vars` stat `Waits.Histograms.StreamConsolidations`.
 
+#### <a id="build-version-in-debug-vars"/>Build Version in `/debug/vars`
+
+The build version (e.g., `19.0.0-SNAPSHOT`) has been added to `/debug/vars`, allowing users to programmatically inspect Vitess components' build version at runtime.
+
 ### <a id="vtgate"/>VTGate
 
 #### <a id="fk-checks-vitess-aware"/>`FOREIGN_KEY_CHECKS` is now a Vitess Aware Variable

go/vt/servenv/buildinfo.go

@@ -33,6 +33,7 @@ var (
 	buildTime             = ""
 	buildGitRev           = ""
 	buildGitBranch        = ""
+	statsBuildVersion     *stats.String
 	jenkinsBuildNumberStr = ""
 
 	// version registers the command line flag to expose build info.
@@ -121,6 +122,8 @@ func init() {
 	stats.NewString("BuildHost").Set(AppVersion.buildHost)
 	stats.NewString("BuildUser").Set(AppVersion.buildUser)
 	stats.NewGauge("BuildTimestamp", "build timestamp").Set(AppVersion.buildTime)
+	statsBuildVersion = stats.NewString("BuildVersion")
+	statsBuildVersion.Set(AppVersion.version)
 	stats.NewString("BuildGitRev").Set(AppVersion.buildGitRev)
 	stats.NewString("BuildGitBranch").Set(AppVersion.buildGitBranch)
 	stats.NewGauge("BuildNumber", "build number").Set(AppVersion.jenkinsBuildNumber)

go/vt/servenv/buildinfo_test.go

@@ -47,3 +47,8 @@ func TestVersionString(t *testing.T) {
 
 	assert.Equal(t, "8.0.30-Vitess", v.MySQLVersion())
 }
+
+func TestBuildVersionStats(t *testing.T) {
+	buildVersion := statsBuildVersion.Get()
+	assert.Equal(t, buildVersion, versionName)
+}

go/vt/vtgate/vtgate.go

@@ -190,7 +190,7 @@ var (
 	vstreamSkewDelayCount = stats.NewCounter("VStreamEventsDelayedBySkewAlignment",
 		"Number of events that had to wait because the skew across shards was too high")
 
-	vindexUnknownParams = stats.NewGauge("VindexUnknownParameters", "Number of parameterss unrecognized by Vindexes")
+	vindexUnknownParams = stats.NewGauge("VindexUnknownParameters", "Number of parameters unrecognized by Vindexes")
 
 	timings = stats.NewMultiTimings(
 		"VtgateApi",

test/README.md

@@ -1,4 +1,4 @@
-##Github CI Workflows
+## Github CI Workflows
 
 This document has a short outline of how tests are run in CI, how to add new tests and where these are configured.
 

web/vtadmin/src/util/tabletDebugVars.ts

@@ -33,6 +33,7 @@ export type TabletDebugVars = Partial<{
     BuildNumber: string;
     BuildTimestamp: string;
     BuildUser: string;
+    BuildVersion: string;
 
     QPS: { [k: string]: number[] };