$ free -hRAM Usage between 40 % and 90 % is generally considered healthy for most workloads.
If RAM Usage is consistently above 90 %, it may indicate that the server is experiencing memory pressure, which can lead to performance issues such as slow response times or application crashes. In such cases, consider adding more RAM to the server or redistributing the workload to other servers with available memory capacity.
Conversely, if RAM Usage is consistently below 40 %, the server may be underutilized. This could indicate that the server has more memory than needed for its current workload. In such situations, you might consider reducing the amount of allocated RAM to save on costs, or repurposing the server for other workloads that require more memory.