Earlier today in Germany, the union representing Lufthansa’s pilots has announced that recent mediation efforts have failed. Talks have broken down to such an extent that the union has threatened to strike despite its earlier commitment to not strike at least until the end of July while giving mediation efforts a chance to work.
The union has stated that no strike has yet been scheduled because it will be up to their committees to determine the exact timing and target of the strikes. I suspect that the first strikes can come as early as this week based on their posturing.
In the past, the union has usually given at least 24 hours warning prior to any work stoppage. Should a strike impact your travels, you will be able to easily rebook your tickets through LH, or request a refund of your fare.