How to handle multiple data attributes with inconsistent timestamps

Building a dashboard that pulls large amount of network information from various data sources, each with different timestamps.

Example

• attribute A is realtime,
• attribute B is updated 10 mins ago,
• Attribute C is updated 2 hours ago,

the challenges presented is user at the moment view these attributes on the dashboard all as most recent, the timing of the data is quite important for userse to make a decision as that is used to resolve network issues. I had later added tooltips to each attribute to inform attributes timestamp, however that is still a bad user experience as users need to however each attribute every time and it was too intensive of an interaction.

ideally the system is real time or collecting data at the same time interval, but that is very unlikely as those back end systems are all different platforms.

If I had to frame the problem it would be "How might I inform users of different piece of data with varying time delays?"

If anyone has any ideas or has came across this sort of problem please let me know.

thanks.