Good morning.
I can only see statistics in my grafana dashboard from my last 15 days.
Is the reason this configuration?
–log-driver json-file
–log-opt max-size=10m
–log-opt max-file=3 \
Thanks.
How are you feeding the data into grafana? Are you using prometheus? If so, what is your retention settings on prometheus?
I have found into prometheus this that for sure need to be changed:
Storage retention 15d
Now I have to investigate how 
SOLUTION:
Adding this line into docker-compose will change the storage time to 10 years:
- '--storage.tsdb.retention.time=10y'
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