Procedure to migrate:
Stop telegraf container:
```
docker-compose -f docker-compose.yml stop telegraf
```
Rename all measurements:
```
docker exec -it influxdb influx -unsafeSsl -ssl -database '$INFLUXDB_DB'
select * into flexpool_miner_balance from flexpool_balance group by *;
drop measurement flexpool_balance;
select * into flexpool_miner_stats from flexpool_stats group by *;
drop measurement flexpool_stats;
select * into flexpool_miner_workers from flexpool_workers group by *;
drop measurement flexpool_workers;
select * into flexpool_miner_paid from flexpool_paid group by *;
drop measurement flexpool_paid;
select * into flexpool_miner_daily_revenue_estimation from flexpool_daily_revenue_estimation group by *;
drop measurement flexpool_daily_revenue_estimation;
select * into flexpool_miner_payments from flexpool_payments group by *;
drop measurement flexpool_payments;
```
Update telegraf configuration.
Start telegraf:
```
docker-compose -f docker-compose.yml start telegraf
```
Re-import the `grafana/flexpool-overview.json` graph.
Signed-off-by: Julien Riou <julien@riou.xyz>
