Create a Plan
Measures and metrics are grouped into a single entity called a plan. Plans provide Resource providers with a way to express the relationship between the measures and metrics. For example, if one needs two measures in order to be able to calculate the value of a metric, it is possible to group the two measures and the metric into a metering plan.
Based on what the plan is responsible for, there are three plan categories: metering, rating, and pricing.
The metering plan defines the metering part of the calculations that Abacus will execute. meter, accumulate, and aggregate functions can be used with a metering plan. For example, consider the object storage metering plan.
The rating plan defines the rating calculations. The charge and rate functions can be used with a metering plan. For example, see object storage rating plan.
The pricing plan defines the pricing on per-measure basis. For example, check the object storage pricing plan.
There are a few predefined plans available in Abacus. You can find the examples with the metrics contained for each plan below:
-
object storage
- storage space
- number of API calls
-
basic analytics
- average number of instances
- number of API calls
-
linux container
- memory usage [GB/h]
Note: The basic analytics metrics use deprecated formulas and you can use them as a reference on how to migrate from the formulas to the new functions format.
By default Abacus defines default functions. You can choose to override them by defining your own function with the same name or to work with the default one.
const meter = (metricName) => (measures) => measures[metricName];
const accumulate = (a, qty, start, end, from, to, twCell) =>
end < from || end >= to ? null : new BigNumber(a || 0).add(qty || 0).toNumber();
const aggregate = (a, prev, curr, aggTwCell, accTwCell) =>
new BigNumber(a || 0)
.add(curr)
.sub(prev || 0)
.toNumber();
const summarize = (t, qty) => qty ? qty : 0;By default the metric function uses measure with the same name. The accumulate and aggregate functions do simple sum. summarize returns the sum.
const rate = (p, qty) => new BigNumber(p || 0).mul(qty).toNumber();
const charge = (t, cost) => cost ? cost : 0;Abacus does not support average out of the box, but this is easily implemented by keeping the sum and the count of elements in compound object. This also increases the accuracy of the result.
{
"plan_id": "average_value",
"measures": [
{
"name": "store",
"unit": "BYTE"
}
],
"metrics": [
{
"name": "store",
"unit": "GIGABYTE",
"type": "discrete",
"meter": "(m) => new BigNumber(m.store).div(1073741824).toNumber()",
"accumulate": "(a, current) => a ? { sum: a.sum + current, count: a.count + 1 } : { sum: current, count: 1 }",
"aggregate": "(a, p, current) => a ? { sum: a.sum + current.sum, count: a.count + current.count } : { sum: current.sum, count: current.count }",
"summarize": "(t, qty) => new BigNumber(qty.sum).div(qty.count).toNumber()"
}
]
}Here we are summing several kinds of transactions (charges, refunds, others) into individual metrics. Then we have a global sum transactions that count the number of all operations. We want to keep a breakdown of the individual components, plus the total count of operations.
{
plan_id: 'transactions-plan',
measures: [
{
name: 'charges',
unit: 'NUMBER'
},
{
name: 'refunds',
unit: 'NUMBER'
},
{
name: 'others',
unit: 'NUMBER'
}
],
metrics: [{
name: 'transactions',
unit: 'NUMBER',
type: 'discrete',
meter: (m) => ({
charges: new BigNumber(m.charges || 0).toNumber(),
refunds: new BigNumber(m.refunds || 0).toNumber(),
others: new BigNumber(m.others || 0).toNumber()
}),
accumulate: (a, c) => {
const charges = a ? new BigNumber(a.charges).add(c.charges) : c.charges
const refunds = a ? new BigNumber(a.refunds).add(c.refunds) : c.refunds;
const others = a ? new BigNumber(a.others).add(c.others) : c.others;
const transactions = a ?
a.transactions.add(charges).add(refunds).add(others) :
new BigNumber(0).add(charges).add(refunds).add(others);
return {
charges: charges.toNumber(),
refunds: refunds.toNumber(),
others: others.toNumber(),
transactions: transactions.toNumber()
};
}
}]
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