ILR visa employer letter about abseanse and employment

[Alexzi]

Hi I am having a little bit of confusion about the absence letter from an employer.
I switched to a different employer in the middle of the Tier 2.

With 1st employer
1) Started employment under Tier 2 general in May 2013 ( for 2 years)
2) In 2015 May, Extended Tier 2 another 3 years until May 2018

In 2016 April, I switched with new sponsor due to some salary requirement
With 2nd Employer
1) Started employment in 2016 April (they gave me another 3 years visa till 2019)

But my 5 years eligibility for ILR is due in 2018 May. (or I have to wait till 2019?)

Questions are,
If I want to get the letter from my previous employer, what information’s they have to include?
1) Tier 2 Started Date + SOC code + started salary
2) Extended in 2015 + New salary
3) In terms of absence, I was away from UK for a holiday in 2014 for 14 days. Other than that I took some holidays frequently.
those holidays were included in my annual leave. But do I have to mention all the regular holidays which I took? Or only the holidays I was away from UK?

With my Current employer, I can get the letter about the absence. But I took 2 weeks of unpaid leaves in 2016 for a family reason. Will this be an issue?

[bcilr18]

Only absences out of the UK need to be reasoned.