Set your 6 quart instant pot on the sauté function. When the pot is hot, add 1 tbsp of extra virgin olive oil.
Add the chopped onions, garlic, and dried rosemary. Sauté until fragrant and onions are translucent.
Add the barley, and continue stir-frying for another 2 minutes.
Add the chopped celery, and continue sautéing until fragrant (about 3 minutes).
Add the chopped carrots, and continue sautéing to release the carrot oil (about 3 minutes).
Add the chicken broth (1 liter), potatoes, and celtic sea salt. Mix the entire pot of ingredients evenly.
Then submerge the drumsticks into the broth, and add the water (Add 500 ml at a time. If the water looks like it will go past the maximum line, stop where the line is.)
Press the "cancel" button to reset the Instant Pot. Close the lid. (Make sure the valve is set to pressure setting.)
Press the "Soup/Broth" button, and set the time to 6 minutes. (It will take about 20 minutes for contents to come up to pressure.)
When the pressure cooking stage is complete, let contents sit for another 14 minutes before doing a "Quick Release" on the valve.
Once the float is down, open the lid, remove the chicken drumsticks, and separate the meat from the bones. Discard the skin, bones, and add the chicken meat back into the soup. Mix well.
Add any final seasoning touches before serving. Scoop soup up into bowls, and finish with freshly chopped parsley.