I'm migrating my InfluxDB1.8 version to InfluxDB2.0
I'm using a influxDB2.0 database and use grafana to display results.
What I insert as data are the results of my P1 meter, altough the results are total values, I would like to calculate and display the daily results.
What is being inserting is the current (gas usage) value. By calculating the difference of the begin and end of the day, I have my daily usage result.
I did find out a way to do this for 1 day. With the Spread function. But I don't get it working for a longer timeframe then 1 day.
But now to display this on a daily usage on a longer timeframe. I didn't find the right option to get this working
Week results
Anyone an idea?
Query for 1 day:
|> range(start: v.timeRangeStart, stop: v.timeRangeStop)
|> filter(fn: (r) => r["_measurement"] == "Gas-usage")
|> filter(fn: (r) => r["_field"] == "value")
|> aggregateWindow(every: v.windowPeriod, fn: mean, createEmpty: false)
|> spread(column: "_value")```
I did some checks on the 1.8 one and what works there is:
SELECT spread("value")
FROM "Gas-usage"
WHERE $timeFilter
GROUP BY time(1d) fill(null) tz('Europe/Berlin')
what is the equivalant of this query in influxdb 2.0 ?
Try change your aggregate window, like this:
|> aggregateWindow(every: 1d, fn: mean)
use the spread function inside your aggreagateWindow function.
should be like this:
|> range(start: v.timeRangeStart, stop: v.timeRangeStop)
|> filter(fn: (r) => r["_measurement"] == "Gas-usage")
|> filter(fn: (r) => r["_field"] == "value")
|> aggregateWindow(every: 1d, fn: spread, createEmpty: false)
from(bucket: "${bucket}")
|> range(start: v.timeRangeStart, stop: v.timeRangeStop)
|> filter(fn: (r) => r["_measurement"] == "system")
|> filter(fn: (r) => r.host == "${host}")
|> filter(fn: (r) => r["_field"] == "uptime")
|> aggregateWindow(every: 1d, fn: spread, createEmpty: false)
result of my grafana
Related
I’m tryingto sum values in InfluxDB but I’m struggling a bit.
So, I have a _measurement "plug" with a field "value".
I have different records within the same bucket with a different ID tag.
I can get the evolution of 1 plug with this query:
from(bucket: "test-bucket")
|> range(start: v.timeRangeStart, stop: v.timeRangeStop)
|> filter(fn: (r) => r["_measurement"] == "plug")
|> filter(fn: (r) => r["_field"] == "value")
|> filter(fn: (r) => r["id"] == "tag1")
|> aggregateWindow(every: v.windowPeriod, fn: mean, createEmpty: false)
|> yield(name: "mean")
What I would like is the exact same graph with the sum of all r["id"].
So, if there is 34 for tag ID "tag1", 11.2 for "tag2" and 0 for "tag3", I would like a graph with 45.2 for that given time.
I’ve tried to use «group()» method, but I get a strange value, more like an average than a sum.
I’ve also tried to use «sum» method, but then, I feel like Influx is summing all the values across the whole timeline. That’s not what I want.
I just like to have a graph with with the sum of «value» field of all "tag" at a given time.
Thanks a lot for you help.
Right now you have a table per tag value. You can use pivot function to merge into a single table, where all the different _value columns are now named after their corresponding tag value:
from(bucket: "test-bucket")
|> range(start: v.timeRangeStart, stop: v.timeRangeStop)
|> filter(fn: (r) => r._measurement == "plug")
|> filter(fn: (r) => r._field == "value")
|> pivot(rowKey: ["_time"], columnKey: ["id"], valueColumn: "_value")
If you know the tag values in advance, the next step is easy:
|> map(fn: (r) => ({ _time: r._time, _value: r["tag1"] + r["tag2"] + r["tag3]}))
If you don't, it gets a bit more complicated. What I would try next in this case is to write a function that combines experimental.unpivot() (note: available since InfluxDB 2.4) with sum(). The trick here is to call this method within map(), so it will operate on a single row (ie, single timestamp) at a time:
sumColumns = (r) => r
|>experimental.unpivot()
|>group
|>sum()
|>findRecord(fn: (key) => true, idx: 0)
from(bucket: "test-bucket")
|> range(start: v.timeRangeStart, stop: v.timeRangeStop)
|> filter(fn: (r) => r._measurement == "plug")
|> filter(fn: (r) => r._field == "value")
|> pivot(rowKey: ["_time"], columnKey: ["id"], valueColumn: "_value")
|> map(fn: sumColumns)
Note that I have not tested this. It is just to give you an idea.
I have data with hydrological measurements.
I want to get the daily max Water flow:
from(bucket: "API")
|> range(start: v.timeRangeStart, stop: v.timeRangeStop)
|> filter(fn: (r) => r["_measurement"] == "hydro")
|> filter(fn: (r) => r["_field"] == "temperature")
|> filter(fn: (r) => r["loc"] == "XXX")
|> aggregateWindow(every: v.windowPeriod, fn: max, createEmpty: false)
|> yield(name: "max")
For some reason, for some days, this returns multiple measurements per day.
But not always.
How do I get only the max entry per day?
You need to set the every parameter in the aggregateWindow method to 1d:
from(bucket: "API")
|> range(start: v.timeRangeStart, stop: v.timeRangeStop)
|> filter(fn: (r) => r["_measurement"] == "hydro")
|> filter(fn: (r) => r["_field"] == "temperature")
|> filter(fn: (r) => r["loc"] == "XXX")
|> aggregateWindow(every: 1d, fn: max, createEmpty: false)
|> yield(name: "max")
See the Flux documentation for more details.
we are using the influxDB for statistics and dashboards. We love it! Blazing fast and easy to integrate. However we are stuck when we launch new features.
We have the following FLUX query. A massive database with all "model_events" based on the businessUUID. However if the business doesn't have a car.created it returns no results instead of a range with 0's. If it has one car.created even without the range it will return a 0 range. Is there a possibility to always get the range even if the _measurement doesn't have a value?
from(bucket: "_events")
|> range(start: 2022-09-01, stop: 2022-09-11)
|> filter(fn: (r) => r["_measurement"] == "car.created")
|> filter(fn: (r) => r["business_uuid"] == "055ade92-ecd9-47b1-bf85-c1381d0afd22")
|> aggregateWindow(every: 1d, fn: count, createEmpty: true)
|> yield(name: "amount")
BTW.... a bit new to InfluxDB...
Maybe you could create a dummy table and union() it like:
import "experimental/array"
rows = [{_time: now(), _field: "someField", _value: 0}]
dummy = array.from(rows: rows)
data = from(bucket: "_events")
|> range(start: 2022-09-01, stop: 2022-09-11)
|> filter(fn: (r) => r["_measurement"] == "car.created")
|> filter(fn: (r) => r["business_uuid"] == "055ade92-ecd9-47b1-bf85-c1381d0afd22")
|> aggregateWindow(every: 1d, fn: count, createEmpty: true)
|> yield(name: "amount")
union(tables: [dummy, data])
Using the new Flux langauge, how best to calculate uptime? My current Flux query looks a bit like this:
from(bucket: "my-bucket")
|> range(start: v.timeRangeStart, stop: v.timeRangeStop)
|> filter(fn: (r) => r["_measurement"] == "process_start_time_seconds")
|> filter(fn: (r) => r["_field"] == "gauge")
|> map(fn: (r) => ({
r with
_value: (int(v: now()) / 1000000000) - int(v: r._value)
})
)
|> aggregateWindow(every: v.windowPeriod, fn: last, createEmpty: false)
This works but seems to be incredibly complex for such a small thing, in Prometheus it's basically one line:
(time() - process_start_time_seconds{job="my-job"})
Is there a way I can improve the Flux query?
I don't think you can simplify it a lot, but here are some ideas:
Store the converted current time in a variable
Don't use aggregateWindow() when you only want to fetch a single value over time
Move the map() as far out as you can for better performance
Use prettier syntax
It could then look like this (just a sketch, not tested for syntax):
currentSeconds = (int(v: now()) / 1000000000)
from(bucket: "my-bucket")
|> range(start: v.timeRangeStart, stop: v.timeRangeStop)
|> filter(fn: (r) => r._measurement == "process_start_time_seconds")
|> filter(fn: (r) => r._field == "gauge")
|> last()
|> map(fn: (r) => ({
r with _value: currentSeconds - int(v: r._value)
})
)
I have a bytes counter being sent to InfluxDB and the below query to show the data:
from(bucket: "PolygonIoStreamTelemetry")
|> range(start: v.timeRangeStart, stop: v.timeRangeStop)
|> filter(fn: (r) => r["_measurement"] == "bytes-received" or r["_measurement"] == "bytes-sent")
|> filter(fn: (r) => r["_field"] == "Value")
|> aggregateWindow(every: v.windowPeriod, fn: last, createEmpty: false)
|> yield(name: "last")
This yields a straight line, I would however like to get a bytes per sample - the difference.
Also when the application resets, this counter would go from zero so there would be a large negative increase for the first sample on reset.
I see there is an Increase function, how would I use it in relation to the above?