Rashi on the Former Prophets

Adonoy's emissary went up. We learn in Seder Olam that this was Pinchos.
To Bochim. The name of a place.
I took you up. This was My original intent, to take you up from Mitzrayim—and I did so—with the stipulation that My enemies be ousted.

Now I have also declared. At present I have declared, in My fury.
At your flanks. They will harass your flanks with bandits and troops, pillaging and plundering.

Yehoshua dismissed, etc. This incident had taken place previously, but, as Scripture intends to relate that they acted wickedly [v.11], it begins with the following statement: at Yehoshua's death, when they resolved, in his presence, to serve Adonoy, he dismissed them, each man to his ancestral property. They served Adonoy throughout his days and the days of the elders. Afterward, "The Bnei Yisroel acted wickedly."

Whose days extended. Their 'days' extended but not their 'years', as they neglected to eulogize him. Thus it is said, "…of Mount Ga'ash"— the mountain stormed at them to slaughter them.

At Timnas Cheres. So entitled because a likeness of the sun was placed over his grave, as if to say, "Alas, that a man who halted the sun lies in the grave."

Wherever they went, the hand of Adonoy was destructive to them. This refers to Elimelech, Machlon, and Chilyon— Seder Olam.

Adonoy established judges. Continuously, in successive generations, as enumerated in this book, judge succeeding judge.

When He would establish—This describes an ongoing process—'When He would establish judges for them, and Adonoy would visit with the judge, etc.'
For He would recant. He would recant, concerning them, from the destruction. This is Yonasan's rendition.
From the outcry—As a result of their cry that went up to Him because of their tormentors

They fell nothing short. They omitted nothing deserving of the reproach inherent in everything that befell them.

Whether they observe. The letter ה is vocalized with the abridged pasach, as it expresses the inquiry involved in testing.