[ixpmanager] pointers in getting sflow up

[Paul Emmons]

Thanks Nick.

I have the BGP Session detect working and that matrix is getting 
updated.How often is the graph generated?

For the p2p I am still getting an error in the laravel logs.
 From the .env
GRAPHER_BACKENDS="mrtg|sflow|smokeping"
. . .
GRAPHER_BACKEND_SFLOW_ENABLED=true
GRAPHER_BACKEND_SFLOW_ROOT="http://192.33.139.19/grapher-sflow"

Log:
[2022-04-19 05:00:24] production.NOTICE: [Grapher] sflow png(): could 
not load rrd file ???
[2022-04-19 05:00:24] production.NOTICE: [Grapher] sflow png(): could 
not load rrd file ???
[2022-04-19 05:00:24] production.NOTICE: [Grapher] sflow png(): could 
not load rrd file ???
[2022-04-19 05:00:24] production.NOTICE: [Grapher] sflow png(): could 
not load rrd file ???

from the sFLOW server

apache2.conf
Alias /grapher-sflow /data/ixpmatrix
<Directory "/data/ixpmatrix">
         Options None
         AllowOverride None
</Directory>

I see graphs building:
DEBUG: individual: building update for vlan: 20 type: pkts protocol: 6 
srcvli: 24
DEBUG: individual: building update for vlan: 20 type: pkts protocol: 6 
srcvli: 12
DEBUG: individual: building update for vlan: 20 type: pkts protocol: 6 
srcvli: 30
DEBUG: individual: building update for vlan: 20 type: pkts protocol: 6 
srcvli: 136
DEBUG: individual: building update for vlan: 20 type: pkts protocol: 6 
srcvli: 170
DEBUG: aggregate: building update for vlan: 20 type: pkts protocol: 6 
file: /data/ixpmatrix/ipv6/pkts/aggregate/aggregate.ipv6.pkts.vlan00020.rrd
DEBUG: individual: building update for vlan: 70 type: pkts protocol: 6 
srcvli: 120
DEBUG: individual: building update for vlan: 70 type: pkts protocol: 6 
srcvli: 86