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Firstly collect the required HTML for your tables on each server like this:

df -g | awk 'NR>1&&($4+0)>70' | awk '
BEGIN {print "<table border=\"1\" cellpadding=\"4\" style=\"border-collapse:...

Good news, glad you are getting the results your after.

One possible issue is these two NR tests highlighted below could be throwing away the first line of your data:

df -g| awk...

You only want 1 line at the top of the table with host name right, best idea is to do this in the begin block like this:

df -g | awk -v host=`hostname` '
BEGIN {
print "<table border=\"1\"...

Just adding my 2 cents here. Another way to get this done would be:
#!/bin/bash
# Do not show the titles of columns:
df -H | grep -vE '^Filesystem' | awk '{ print $5 " " $1 }' | while read...

first off, assistance you receive on this website is offered by unpaid volunteers on their own time -- that includes me -- so it would be good to maintain a professional tone ...

second, your...

Please pay attention to what somebody posts.

Just Ice has piped the output to grep to exclude header line.

Another option to skip header:
df -g | awk 'NR>1&&($4+0)>70' > report.txt

if [...

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