Deprecating label flag and introducing labels-filter flag

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

Author: davidhaja

main.go

@@ -133,6 +133,7 @@ func main() {
 		autoInstrumentationNginx         string
 		autoInstrumentationGo            string
 		labelsFilter                     []string
+		tmplabelsFilter                  []string
 		annotationsFilter                []string
 		webhookPort                      int
 		tlsOpt                           tlsConfig
@@ -170,7 +171,8 @@ func main() {
 	stringFlagOrEnv(&autoInstrumentationGo, "auto-instrumentation-go-image", "RELATED_IMAGE_AUTO_INSTRUMENTATION_GO", fmt.Sprintf("ghcr.io/open-telemetry/opentelemetry-go-instrumentation/autoinstrumentation-go:%s", v.AutoInstrumentationGo), "The default OpenTelemetry Go instrumentation image. This image is used when no image is specified in the CustomResource.")
 	stringFlagOrEnv(&autoInstrumentationApacheHttpd, "auto-instrumentation-apache-httpd-image", "RELATED_IMAGE_AUTO_INSTRUMENTATION_APACHE_HTTPD", fmt.Sprintf("ghcr.io/open-telemetry/opentelemetry-operator/autoinstrumentation-apache-httpd:%s", v.AutoInstrumentationApacheHttpd), "The default OpenTelemetry Apache HTTPD instrumentation image. This image is used when no image is specified in the CustomResource.")
 	stringFlagOrEnv(&autoInstrumentationNginx, "auto-instrumentation-nginx-image", "RELATED_IMAGE_AUTO_INSTRUMENTATION_NGINX", fmt.Sprintf("ghcr.io/open-telemetry/opentelemetry-operator/autoinstrumentation-apache-httpd:%s", v.AutoInstrumentationNginx), "The default OpenTelemetry Nginx instrumentation image. This image is used when no image is specified in the CustomResource.")
-	pflag.StringArrayVar(&labelsFilter, "label", []string{}, "Labels to filter away from propagating onto deploys. It should be a string array containing patterns, which are literal strings optionally containing a * wildcard character. Example: --label=.*filter.out will filter out labels that looks like: label.filter.out: true")
+	pflag.StringArrayVar(&labelsFilter, "labels-filter", []string{}, "Labels to filter away from propagating onto deploys. It should be a string array containing patterns, which are literal strings optionally containing a * wildcard character. Example: --labels-filter=.*filter.out will filter out labels that looks like: label.filter.out: true")
+	pflag.StringArrayVar(&tmplabelsFilter, "label", []string{}, "(Deprecated, please use the labels-filter flag) Labels to filter away from propagating onto deploys. It should be a string array containing patterns, which are literal strings optionally containing a * wildcard character. Example: --label=.*filter.out will filter out labels that looks like: label.filter.out: true")
 	pflag.StringArrayVar(&annotationsFilter, "annotations-filter", []string{}, "Annotations to filter away from propagating onto deploys. It should be a string array containing patterns, which are literal strings optionally containing a * wildcard character. Example: --annotations-filter=.*filter.out will filter out annotations that looks like: annotation.filter.out: true")
 	pflag.StringVar(&tlsOpt.minVersion, "tls-min-version", "VersionTLS12", "Minimum TLS version supported. Value must match version names from https://golang.org/pkg/crypto/tls/#pkg-constants.")
 	pflag.StringSliceVar(&tlsOpt.cipherSuites, "tls-cipher-suites", nil, "Comma-separated list of cipher suites for the server. Values are from tls package constants (https://golang.org/pkg/crypto/tls/#pkg-constants). If omitted, the default Go cipher suites will be used")
@@ -181,6 +183,9 @@ func main() {
 	pflag.IntVar(&webhookPort, "webhook-port", 9443, "The port the webhook endpoint binds to.")
 	pflag.Parse()
 
+	// Using labelfilters both from label and labels-filter flags, until label flag is removed
+	labelsFilter = append(labelsFilter, tmplabelsFilter...)
+
 	opts.EncoderConfigOptions = append(opts.EncoderConfigOptions, func(ec *zapcore.EncoderConfig) {
 		ec.MessageKey = encodeMessageKey
 		ec.LevelKey = encodeLevelKey