You are using Collectd 4, which is deprecated by CGP. Graphs like df and interfaces may be incomplete.
Oranienburg_DieLinke_4009

interface

"-l" "0" "-w" "800" "-h" "350" "-t" "Interface Errors (wlan0-adhoc-2) on Oranienburg_DieLinke_4009" "-v" "Errors per second" "-s" "e-86400" "DEF:min_20ef085_raw=rrd.php?path=Oranienburg_DieLinke_4009%2Finterface-wlan0-adhoc-2%2Fif_errors.rrd:rx:MIN" "DEF:avg_20ef085_raw=rrd.php?path=Oranienburg_DieLinke_4009%2Finterface-wlan0-adhoc-2%2Fif_errors.rrd:rx:AVERAGE" "DEF:max_20ef085_raw=rrd.php?path=Oranienburg_DieLinke_4009%2Finterface-wlan0-adhoc-2%2Fif_errors.rrd:rx:MAX" "DEF:min_54545703_raw=rrd.php?path=Oranienburg_DieLinke_4009%2Finterface-wlan0-adhoc-2%2Fif_errors.rrd:tx:MIN" "DEF:avg_54545703_raw=rrd.php?path=Oranienburg_DieLinke_4009%2Finterface-wlan0-adhoc-2%2Fif_errors.rrd:tx:AVERAGE" "DEF:max_54545703_raw=rrd.php?path=Oranienburg_DieLinke_4009%2Finterface-wlan0-adhoc-2%2Fif_errors.rrd:tx:MAX" "CDEF:min_20ef085=min_20ef085_raw,1,*" "CDEF:avg_20ef085=avg_20ef085_raw,1,*" "CDEF:max_20ef085=max_20ef085_raw,1,*" "VDEF:tot_20ef085=avg_20ef085,TOTAL" "CDEF:min_54545703=min_54545703_raw,1,*" "CDEF:avg_54545703=avg_54545703_raw,1,*" "CDEF:max_54545703=max_54545703_raw,1,*" "CDEF:avg_54545703_neg=avg_54545703_raw,1,*" "VDEF:tot_54545703=avg_54545703,TOTAL" "CDEF:overlap=avg_20ef085,avg_54545703_neg,LT,avg_20ef085,avg_54545703_neg,IF" "AREA:avg_20ef085#bfbfff" "AREA:avg_54545703_neg#bfebbf" "AREA:overlap#bfe0cf" "LINE1:avg_20ef085#0000ff:Receive " "GPRINT:min_20ef085:MIN:%5.1lf%s Min," "GPRINT:avg_20ef085:AVERAGE:%5.1lf%s Avg," "GPRINT:max_20ef085:MAX:%5.1lf%s Max," "GPRINT:avg_20ef085:LAST:%5.1lf%s Last" "GPRINT:tot_20ef085:%5.1lf%s Total\l" "LINE1:avg_54545703_neg#00b000:Transmit" "GPRINT:min_54545703:MIN:%5.1lf%s Min," "GPRINT:avg_54545703:AVERAGE:%5.1lf%s Avg," "GPRINT:max_54545703:MAX:%5.1lf%s Max," "GPRINT:avg_54545703:LAST:%5.1lf%s Last" "GPRINT:tot_54545703:%5.1lf%s Total\l"