The article says the shelling was accidental, but it is not clear to me exactly how they know that. Importantly, no one was injured or killed. That said, there is some risk the Syrians are trying to pull the Israelis into a conflict to end their civil war. Such a move could easily spiral out of control and into a general regional war.
"IDF ground forces fired a warning shot at the Syrian military on Sunday for the first time since the 1973 Yom Kippur War.
They shot the guided missile after a stray Syrian shell from civil strife in that country exploded on the Golan Heights for the second time in recent days.
The shell hit as Israel suffered a barrage of missiles from Gaza, putting the IDF in the position of monitoring enemy fire along both the northern and southern borders.
“In the midst of Syrian infighting, a mortar shell fired by the Syrian Army struck near an [IDF] outpost at Tel Azeka,” IDF spokesman Brig.- Gen. Yoav Mordechai said.
The shell failed to cause injuries or damage. It was one of a series that hit Israeli territory."