Why is the A-10 being retired?

Could you please elaborate on the reasons behind the retirement of the A-10? Is it due to the emergence of more advanced aircraft that have surpassed its capabilities? Or is it a matter of financial constraints and the need to redirect resources towards newer technologies? Additionally, how will the retirement of the A-10 impact the US Air Force's close air support capabilities, and what measures are being taken to ensure a smooth transition and maintain operational readiness?