fix(inputs.mysql): Parse boolean values in metric v1 correctly

plugins/inputs/mysql/mysql.go

@@ -55,8 +55,9 @@ type Mysql struct {
 
 	Log telegraf.Logger `toml:"-"`
 	tls.ClientConfig
-	lastT          time.Time
-	getStatusQuery string
+	lastT               time.Time
+	getStatusQuery      string
+	loggedConvertFields map[string]bool
 }
 
 const (
@@ -85,6 +86,8 @@ func (m *Mysql) Init() error {
 		m.Servers = append(m.Servers, &s)
 	}
 
+	m.loggedConvertFields = make(map[string]bool)
+
 	// Register the TLS configuration. Due to the registry being a global
 	// one for the mysql package, we need to define unique IDs to avoid
 	// side effects and races between different plugin instances. Therefore,
@@ -773,7 +776,24 @@ func (m *Mysql) gatherGlobalStatuses(db *sql.DB, servtag string, acc telegraf.Ac
 			for _, mapped := range v1.Mappings {
 				if strings.HasPrefix(key, mapped.OnServer) {
 					// convert numeric values to integer
-					i, _ := strconv.Atoi(string(val))
+					var i int
+					v := string(val)
+					switch v {
+					case "ON", "true":
+						i = 1
+					case "OFF", "false":
+						i = 0
+					default:
+						if i, err = strconv.Atoi(v); err != nil {
+							// Make the value a <nil> value to prevent adding
+							// the field containing nonsense values.
+							i = 0
+							if !m.loggedConvertFields[key] {
+								m.Log.Warnf("Cannot convert value %q for key %q to integer outputting zero...", v, key)
+								m.loggedConvertFields[key] = true
+							}
+						}
+					}
 					fields[mapped.InExport+key[len(mapped.OnServer):]] = i
 					found = true
 				}

plugins/inputs/mysql/mysql_test.go

@@ -38,8 +38,10 @@ func TestMysqlDefaultsToLocalIntegration(t *testing.T) {
 
 	dsn := fmt.Sprintf("root@tcp(%s:%s)/", container.Address, container.Ports[servicePort])
 	s := config.NewSecret([]byte(dsn))
+	defer s.Destroy()
 	m := &Mysql{
 		Servers: []*config.Secret{&s},
+		Log:     &testutil.Logger{},
 	}
 	require.NoError(t, m.Init())
 
@@ -74,11 +76,13 @@ func TestMysqlMultipleInstancesIntegration(t *testing.T) {
 
 	dsn := fmt.Sprintf("root@tcp(%s:%s)/?tls=false", container.Address, container.Ports[servicePort])
 	s := config.NewSecret([]byte(dsn))
+	defer s.Destroy()
 	m := &Mysql{
 		Servers:          []*config.Secret{&s},
 		IntervalSlow:     config.Duration(30 * time.Second),
 		GatherGlobalVars: true,
 		MetricVersion:    2,
+		Log:              &testutil.Logger{},
 	}
 	require.NoError(t, m.Init())
 
@@ -93,6 +97,7 @@ func TestMysqlMultipleInstancesIntegration(t *testing.T) {
 	m2 := &Mysql{
 		Servers:       []*config.Secret{&s2},
 		MetricVersion: 2,
+		Log:           &testutil.Logger{},
 	}
 	require.NoError(t, m2.Init())
 
@@ -126,9 +131,11 @@ func TestPercona8Integration(t *testing.T) {
 
 	dsn := fmt.Sprintf("root:secret@tcp(%s:%s)/", container.Address, container.Ports[servicePort])
 	s := config.NewSecret([]byte(dsn))
+	defer s.Destroy()
 	plugin := &Mysql{
 		Servers:              []*config.Secret{&s},
 		GatherUserStatistics: true,
+		Log:                  &testutil.Logger{},
 	}
 	require.NoError(t, plugin.Init())
 
@@ -141,6 +148,44 @@ func TestPercona8Integration(t *testing.T) {
 	require.True(t, acc.HasFloatField("mysql_user_stats", "busy_time"))
 }
 
+func TestGaleraIntegration(t *testing.T) {
+	if testing.Short() {
+		t.Skip("Skipping integration test in short mode")
+	}
+
+	container := testutil.Container{
+		Image:        "bitnami/mariadb-galera",
+		Env:          map[string]string{"ALLOW_EMPTY_PASSWORD": "yes"},
+		ExposedPorts: []string{servicePort},
+		WaitingFor: wait.ForAll(
+			wait.ForLog("Synchronized with group, ready for connections"),
+			wait.ForListeningPort(nat.Port(servicePort)),
+		),
+	}
+	require.NoError(t, container.Start(), "failed to start container")
+	defer container.Terminate()
+
+	dsn := fmt.Sprintf("root@tcp(%s:%s)/", container.Address, container.Ports[servicePort])
+	s := config.NewSecret([]byte(dsn))
+	defer s.Destroy()
+	plugin := &Mysql{
+		Servers: []*config.Secret{&s},
+		Log:     &testutil.Logger{},
+	}
+	require.NoError(t, plugin.Init())
+
+	var acc testutil.Accumulator
+	require.NoError(t, plugin.Gather(&acc))
+	require.Empty(t, acc.Errors)
+	require.True(t, acc.HasIntField("mysql", "wsrep_ready"))
+	for _, m := range acc.GetTelegrafMetrics() {
+		if v, found := m.GetField("wsrep_ready"); found {
+			require.EqualValues(t, 1, v, "invalid value for field wsrep_ready")
+			break
+		}
+	}
+}
+
 func TestMysqlGetDSNTag(t *testing.T) {
 	tests := []struct {
 		input  string