lib/streamaggr: set correct suffix <output>_prometheus (#6228)

Set correct suffix `<output>_prometheus` for aggregation outputs
`increase_prometheus` and `total_prometheus`
Before, outputs `total` and `total_prometheus` or `increase` and
`increase_prometheus` had the same suffix.

Signed-off-by: hagen1778 <roman@victoriametrics.com>

docs/CHANGELOG.md

@@ -41,6 +41,7 @@ See also [LTS releases](https://docs.victoriametrics.com/lts-releases/).
 
 * BUGFIX: [vmui](https://docs.victoriametrics.com/#vmui): fix bug that prevents the first query trace from expanding on click event. See [this issue](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/6186). The issue was introduced in [v1.100.0](https://docs.victoriametrics.com/changelog/#v11000) release.
 * BUGFIX: [vmagent](https://docs.victoriametrics.com/vmagent/): prevent potential panic during [stream aggregation](https://docs.victoriametrics.com/stream-aggregation.html) if more than one `--remoteWrite.streamAggr.dedupInterval` is configured. See [this issue](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/6205).
+* BUGFIX: [stream aggregation](https://docs.victoriametrics.com/stream-aggregation/): set correct suffix `<output>_prometheus` for aggregation outputs [increase_prometheus](https://docs.victoriametrics.com/stream-aggregation/#increase_prometheus) and [total_prometheus](https://docs.victoriametrics.com/stream-aggregation/#total_prometheus). Before, outputs `total` and `total_prometheus` or `increase` and `increase_prometheus` had the same suffix.
 
 ## [v1.101.0](https://github.com/VictoriaMetrics/VictoriaMetrics/releases/tag/v1.101.0)
 

lib/streamaggr/streamaggr_test.go

@@ -518,8 +518,8 @@ foo:1m_total 0
 `, `
 foo 123
 bar{baz="qwe"} 4.34
-`, `bar:1m_total{baz="qwe"} 0
+`, `bar:1m_total_prometheus{baz="qwe"} 0
-foo:1m_total 0
+foo:1m_total_prometheus 0
 `, "11")
 
 	// total output for repeated series
@@ -554,10 +554,10 @@ foo{baz="qwe"} -5
 bar{baz="qwer"} 343
 bar{baz="qwer"} 344
 foo{baz="qwe"} 10
-`, `bar:1m_total{baz="qwe"} 5.02
+`, `bar:1m_total_prometheus{baz="qwe"} 5.02
-bar:1m_total{baz="qwer"} 1
+bar:1m_total_prometheus{baz="qwer"} 1
-foo:1m_total 0
+foo:1m_total_prometheus 0
-foo:1m_total{baz="qwe"} 15
+foo:1m_total_prometheus{baz="qwe"} 15
 `, "11111111")
 
 	// total output for repeated series with group by __name__
@@ -592,8 +592,8 @@ foo{baz="qwe"} -5
 bar{baz="qwer"} 343
 bar{baz="qwer"} 344
 foo{baz="qwe"} 10
-`, `bar:1m_total 6.02
+`, `bar:1m_total_prometheus 6.02
-foo:1m_total 15
+foo:1m_total_prometheus 15
 `, "11111111")
 
 	// increase output for non-repeated series
@@ -614,8 +614,8 @@ foo:1m_increase 0
 `, `
 foo 123
 bar{baz="qwe"} 4.34
-`, `bar:1m_increase{baz="qwe"} 0
+`, `bar:1m_increase_prometheus{baz="qwe"} 0
-foo:1m_increase 0
+foo:1m_increase_prometheus 0
 `, "11")
 
 	// increase output for repeated series
@@ -650,10 +650,10 @@ foo{baz="qwe"} -5
 bar{baz="qwer"} 343
 bar{baz="qwer"} 344
 foo{baz="qwe"} 10
-`, `bar:1m_increase{baz="qwe"} 5.02
+`, `bar:1m_increase_prometheus{baz="qwe"} 5.02
-bar:1m_increase{baz="qwer"} 1
+bar:1m_increase_prometheus{baz="qwer"} 1
-foo:1m_increase 0
+foo:1m_increase_prometheus 0
-foo:1m_increase{baz="qwe"} 15
+foo:1m_increase_prometheus{baz="qwe"} 15
 `, "11111111")
 
 	// multiple aggregate configs

lib/streamaggr/total.go

@@ -53,6 +53,9 @@ func newTotalAggrState(stalenessInterval time.Duration, resetTotalOnFlush, keepF
 	if resetTotalOnFlush {
 		suffix = "increase"
 	}
+	if !keepFirstSample {
+		suffix += "_prometheus"
+	}
 	return &totalAggrState{
 		suffix:                    suffix,
 		resetTotalOnFlush:         resetTotalOnFlush,