Battery monitors typically show battery voltage (Vbatt), Amps or Watts in (charging) / out (discharging). Amp counting is an important metric because voltage on a circuit is affected by current, particularly if the wire is undersized.
Watching amps trail off at the end of Absorption (endAmps) will also tell you when the bank is at 100% State of Charge. The battery manufacturer will specify something like C/200 or C/100 as a sign Absorption is complete.
One benefit of having a shunt-based monitor over a charge controller monitor is the shunt can discern between [dis]charging vs [dis]charging+loads
The most famous battery monitor is the Bogart Tri-Metric TM-2030 series.
This monitor will interface and operate their SX-2030 solar charge controller. The monitor will still provide amp-counting and other metrics when used on it's own.