// Shard the coll
mongos> db.adminCommand({
  shardCollection: 'test.mycoll',
  key: {_id: 1}
})

// On the shard that the collection lives, set a failpoint here:
// https://github.com/mongodb/mongo/blob/aadd0e171ac7aa8982618db9aad0dab283d7cdeb/src/mongo/db/s/metadata_consistency_util.cpp#L649
shard-rs0:primary> db.adminCommand({
    configureFailPoint: "pauseBeforeAgg",
    mode: "alwaysOn"
});

// Try to check metadata consistency - this will hang on the failpoint.
mongos> db.checkMetadataConsistency();

// Collmod on the shard directly. This is something that upgrading / downgrading
// would usually trigger:
shard-rs0:primary> db.runCommand({collMod: 'mycoll', validator: {a: {$gt: -10}}});

// Turn off the failpoint to let checkMetadataConsistency complete
shard-rs0:primary> db.adminCommand({
    configureFailPoint: "pauseBeforeAgg",
    mode: "off"
});

// checkMetadataConsistency would have errored:
{
	"cursor" : {
		"id" : NumberLong(0),
		"ns" : "test.$cmd.aggregate",
		"firstBatch" : [
			{
				"type" : "CollectionOptionsMismatch",
				"description" : "Collection registered on the sharding catalog not found on the given shards",
				"details" : {
					"namespace" : "test.mycoll",
					"options" : [
						{
							"shards" : [
								"shard-rs0"
							],
							"options" : {
								"uuid" : UUID("095a4222-0ba3-4d22-b295-fbbf010ce6f9"),
								"validator" : {
									"a" : {
										"$gt" : -10
									}
								},
								"validationLevel" : "strict",
								"validationAction" : "error"
							}
						},
						{
							"shards" : [
								"shard-rs0"
							],
							"options" : {
								"uuid" : UUID("095a4222-0ba3-4d22-b295-fbbf010ce6f9")
							}
						}
					]
				}
			}
		]
	},
	"ok" : 1,
	...
}