cat check_time
name2 group1 value1
name1 group2 value1
name4 group1 value2
name2 group3 value2
name3 group3 value2
name2 group2 value2
name3 group2 value1
name1 group4 value1
name2 group4 value1
name1 group4 value1
name4 group4 value2
name2 group5 value2
name3 group5 value2
name2 group5 value2
name3 group5 value1
name3 group6 value1
name3 group6 value1

cat check_time.ksh
LINES=`awk 'END{print NR}' check_time`
 
awk -vLIN="$LINES" '{if((X != $2 && X)){S=$2_name;S_S[++i]=$0; {if(k%2==0 && k){print S_S[--i];} else {print Q OFS X OFS "missing";k="";}}}} {if(X==$2 && X){if(Y==$3 && Y){k=k+2} else {k--}}} {A++;} {if(A==LIN){if(X==$2 && Y==$3 && k%2==0){print S_S[i]} else {$3="missing";print $0}}} {Q=$1;X=$2;Y=$3}' check_time | awk '!S[$2]++'

./check_time.ksh
name2 group1 missing
name1 group2 missing
name2 group3 value2
name4 group4 missing
name3 group5 missing
name3 group6 value1

LINES=`awk 'END{print NR}' check_time`

awk -vLIN="$LINES" '
{if((X != $2 && X))
        {S=$2_name;S_S[++i]=$0;
        {if(k%2==0 && k)
                {print S_S[--i];}
        else
                {print Q OFS X OFS "missing";k="";}
        }
        }
}
{if(X==$2 && X)
        {if(Y==$3 && Y)
                {k=k+2}
        else
                {k--}
        }
}
{A++;}
{if(A==LIN)
        {if(X==$2 && Y==$3 && k%2==0)
                {print S_S[i]}
        else
                {$3="missing";print $0}
        }
}
{Q=$1;X=$2;Y=$3}' check_time | awk '!S[$2]++'