Add absolute time timestamp in addition to uptime

[kungasc]

When resolving an incident it's impossible to match relative uptime to any metric dashboards

Tablets uptime

Host uptime

[antonkovalenko]

@kunga would it be better to see absolute time of tablet or node start?

[antonkovalenko]

Display tooltip over uptime value with absolute time in user's local timezone. with zone code.

[kungasc]

@kunga would it be better to see absolutely time of tablet or node start?

The problem should be solved for both tablets and nodes (if that what you've asked)

[antonkovalenko]

It is better to them together #1065