After rrd migration graph is not recording values

Problem

After the rrd migration for some reasons some graphs are not recording values:

Solution

Change to the rrd directory

OMD[mysite]:~$ cd var/check_mk/rrd/<HOSTNAME>

How many metrics are stored in the .info file?

OMD[mysite]:~/var/check_mk/rrd/myhost.txt$ cat Interface_2.info 
HOST myhost
SERVICE Interface eth0
METRICS outqlen;in;out;inerr;inmcast;inbcast;inucast;innucast;indisc;outerr;outmcast;outbcast;outucast;outnucast;outdisc

15 Metrics are stored here

How many datasources do we have in the .rrd file?

OMD[test]:~/var/check_mk/rrd/kirchner_check_mk_agent_output.txt$ rrdtool info Interface_2.rrd |grep "last_ds"
ds[1].last_ds = "U"
ds[2].last_ds = "U"
ds[3].last_ds = "U"
ds[4].last_ds = "0"
ds[7].last_ds = "U"
ds[8].last_ds = "U"
ds[9].last_ds = "U"
ds[10].last_ds = "U"
ds[13].last_ds = "U"
ds[14].last_ds = "U"
ds[15].last_ds = "U"

--> 11 Datasources are stored. As described in the cmc.log, the DS 5,6,11 and 12 are missing

So here we have a mismatch of the amount of metrics in the .info (15 Metrics ) file and the amount of Datasources (11 DS) in the .rrd file
We need to create the missing DS into the rrd file.

Before continuing here, please note that we do not provide support for any broken .rrd file. Please be careful and do a backup of that files beforehand.
1. Stop the site
```
OMD[mysite]:~$ omd stop
```
2. Create the 4 missing datasources
```
rrdtool tune Interface_2.rrd DS:5:GAUGE:8460:0:U
rrdtool tune Interface_2.rrd DS:6:GAUGE:8460:0:U
rrdtool tune Interface_2.rrd DS:11:GAUGE:8460:0:U
rrdtool tune Interface_2.rrd DS:12:GAUGE:8460:0:U
```
  More information about the command could be found here: https://oss.oetiker.ch/rrdtool/doc/rrdtune.en.html
3. Start the site
```
OMD[mysite]:~$ omd start
```

Problem

Solution

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