/**
* Normalize a metric key for StatsD
*
- * Replace occurences of '::' with dots and any other non-alphabetic
+ * Replace occurences of '::' with dots and any other non-alphanumeric
* characters with underscores. Combine runs of dots or underscores.
* Then trim leading or trailing dots or underscores.
*
*/
private static function normalizeMetricKey( $key ) {
$key = preg_replace( '/[:.]+/', '.', $key );
- $key = preg_replace( '/[^a-z.]+/i', '_', $key );
+ $key = preg_replace( '/[^a-z0-9.]+/i', '_', $key );
$key = trim( $key, '_.' );
return str_replace( array( '._', '_.' ), '.', $key );
}