Quasar absorption line systems are an excellent probe of metal enrichment across time. In particular, absorption line systems tracing the interstellar (ISM) and circumgalactic medium (CGM) of galaxies are ideal environments for measuring metal enrichment and constraining feedback processes within galaxies. While current observations can begin to unravel the complexities of the underlying feedback processes, upcoming surveys using WEAVE and 4MOST are expected to revolutionize the field by providing large statistical samples with modestly high spectral resolution. In this talk, I will highlight recent results on the cosmic metal enrichment of sub-damped Lyman alpha systems (HI column densities of 19.0<=logN(HI)<20.3) identified in the XQ-100 legacy survey and how they may be able to constrain the strength of feedback processes in galaxies from redshifts z~4 to z~2. From here, I will present ongoing efforts to identify these galaxy-class absorbers in WEAVE spectra and why such large samples with WEAVE and 4MOST are necessary to improve these constraints on metal enrichment and feedback in the CGM and ISM.
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