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Not sure if this is the most elegant solution:
awk '
/^====/ {PRF = $2 = "0"$2
}
{print PRF, $0
}
' file |
sort -uk1,1 -k3 |
awk '
{X = $1
CNT[X]++...

awk '
/^====/ {PRF = $2 = "0"$2 # save the server info for the prefix &
} # add a "0" to server info for sorting
{print PRF, $0...

Try
awk '/^====/ {PRF = $2 = "0"$2} {print PRF, $0}' file | sort -uk1,1 -k3 | awk '{sub ($1 FS, _); sub (/^0/, _, $2)}1'
========== server_1 ==========
sample2.gz: 2016-09-14 01:09:56,796...

So - you have coloured output in the files? Can't they be produced without colour information?

Do you need the server_n info in the sorted output? If not, try
sort -uk2 file4
sample2.gz:...

Where and how did you assign the variables in the first place?

Remove the control codes when/before assigning the variables.

You have "ECMA-48 Set Graphics Rendition" control codes in your variable definition - that's how the 62 char is reached. I think, sed complains about opening but no closing square brackets.

There's no 62 chars in that regex; try setting the -vx options on the remote node, e.g. just before cd in the ssh command...

After (c.f. man zcat) there's no compressed data any more, so using zgrep is overkill (although it may work as zgrep recognizes and works on uncompressed data).

2nd point: you have ...

There seem to be several problems with your above code:
- shell variable assignment doesn't allow for spaces, so remove those around the "=" sign, and use quoting or escaping for the contents.
-...