jeremiad

A literary work or speech expressing a bitter lament or a righteous prophecy of doom.

Lamentation; an utterance of grief or sorrow; a complaining tirade: used with a spice of ridicule or mockery, implying either that the grief itself is unnecessarily great, or that the utterance of it is tediously drawn out and attended with a certain satisfaction to the utterer.

A tale of sorrow, disappointment, or complaint; a doleful story; a dolorous tirade; — generally used satirically.

A long speech or prose work that bitterly laments the state of society and its morals, and often contains a prophecy of its coming downfall.

a long and mournful complaint