event: add custom downstream sticky event
event: add custom downstream sticky event

centricular/gstreamer,krieger-od/gstreamer,collects/gstreamer,cfoch/gstreamer,centricular/gstreamer,jpxiong/gstreamer,krichter722/gstreamer,cfoch/gstreamer,collects/gstreamer,collects/gstreamer,justinjoy/gstreamer,jpxiong/gstreamer,mparis/gstreamer,jpakkane/gstreamer,krieger-od/gstreamer,lubosz/gstreamer,surround-io/gstreamer,cablelabs/gstreamer,shelsonjava/gstreamer,lovebug356/gstreamer,lovebug356/gstreamer,lovebug356/gstreamer,krichter722/gstreamer,jpakkane/gstreamer,StreamUtils/gstreamer,lubosz/gstreamer,ensonic/gstreamer,krieger-od/gstreamer,cablelabs/gstreamer,jpakkane/gstreamer,cablelabs/gstreamer,lovebug356/gstreamer,jpxiong/gstreamer,krichter722/gstreamer,cfoch/gstreamer,cfoch/gstreamer,mparis/gstreamer,centricular/gstreamer,StreamUtils/gstreamer,lovebug356/gstreamer,cfoch/gstreamer,ensonic/gstreamer,krichter722/gstreamer,centricular/gstreamer,justinjoy/gstreamer,jpxiong/gstreamer,jpakkane/gstreamer,krichter722/gstreamer,mparis/gstreamer,Lachann/gstreamer,cablelabs/gstreamer,surround-io/gstreamer,ensonic/gstreamer,shelsonjava/gstreamer,mparis/gstreamer,krieger-od/gstreamer,StreamUtils/gstreamer,justinjoy/gstreamer,collects/gstreamer,lubosz/gstreamer,Lachann/gstreamer,surround-io/gstreamer,justinjoy/gstreamer,shelsonjava/gstreamer,centricular/gstreamer,cablelabs/gstreamer,shelsonjava/gstreamer,jpxiong/gstreamer,lubosz/gstreamer,jpakkane/gstreamer,mparis/gstreamer,surround-io/gstreamer,Lachann/gstreamer,lubosz/gstreamer,ensonic/gstreamer,Lachann/gstreamer,krieger-od/gstreamer,StreamUtils/gstreamer,shelsonjava/gstreamer,StreamUtils/gstreamer,justinjoy/gstreamer,ensonic/gstreamer,surround-io/gstreamer,collects/gstreamer,Lachann/gstreamer