Flux 0.93 (#1760)

* added flux-0.92 and cardinality function

* added flux 0.93 release notes

* removed unsupported types from cardinality params

* updated cardinality function to address PR feedback

content/influxdb/v2.0/reference/flux/stdlib/influxdb/_index.md

@@ -0,0 +1,24 @@
+---
+title: Flux InfluxDB package
+list_title: InfluxDB package
+description: >
+  The Flux InfluxDB package provides functions for analyzing InfluxDB metadata.
+  Import the `influxdata/influxdb` package.
+menu:
+  influxdb_2_0_ref:
+    name: InfluxDB
+    identifier: influxdb-pkg
+    parent: Flux standard library
+weight: 202
+influxdb/v2.0/tags: [functions, package]
+introduced: 0.92.0
+---
+
+The Flux InfluxDB package provides functions for analyzing InfluxDB metadata.
+Import the `influxdata/influxdb` package:
+
+```js
+import "influxdata/influxdb"
+```
+
+{{< children type="functions" show="pages" >}}

content/influxdb/v2.0/reference/flux/stdlib/influxdb/cardinality.md

@@ -0,0 +1,137 @@
+---
+title: influxdb.cardinality() function
+description: The `influxdb.cardinality()` function returns the series cardinality of data stored in InfluxDB Cloud.
+menu:
+  influxdb_2_0_ref:
+    name: influxdb.cardinality
+    parent: influxdb-pkg
+weight: 301
+influxdb/v2.0/tags: [cardinality]
+related:
+  - /{{< latest "influxdb" "v1" >}}/query_language/spec/#show-cardinality, SHOW CARDINALITY in InfluxQL
+introduced: 0.92.0
+---
+
+The `influxdb.cardinality()` function returns the [series cardinality](/{{< latest "influxdb" "v2" >}}/reference/glossary#series-cardinality) of data stored in InfluxDB Cloud.
+
+{{% cloud %}}
+**InfluxDB Cloud** supports the `influxdb.cardinality()` function, but **InfluxDB OSS does not**.
+{{% /cloud %}}
+
+```js
+import "influxdata/influxdb"
+
+influxdb.cardinality(
+  bucket: "example-bucket",
+  org: "example-org",
+  host: "https://cloud2.influxdata.com",
+  token: "MySuP3rSecr3Tt0k3n",
+  start: -30d,
+  stop: now(),
+  predicate: (r) => true
+)
+
+// OR
+
+influxdb.cardinality(
+  bucketID: "00xXx0x00xXX0000",
+  orgID: "00xXx0x00xXX0000",
+  host: "https://cloud2.influxdata.com",
+  token: "MySuP3rSecr3Tt0k3n",
+  start: -30d,
+  stop: now(),
+  predicate: (r) => true
+)
+```
+
+## Parameters
+
+### bucket
+Bucket to query cardinality from.
+
+_**Data type:** String_
+
+### bucketID
+String-encoded bucket ID to query cardinality from.
+
+_**Data type:** String_
+
+### org
+Organization name.
+
+_**Data type:** String_
+
+### orgID
+String-encoded [organization ID](/influxdb/v2.0/organizations/view-orgs/#view-your-organization-id) to query cardinality from.
+
+_**Data type:** String_
+
+### host
+URL of the InfluxDB instance to query.
+_See [InfluxDB URLs](/influxdb/v2.0/reference/urls/)._
+
+_**Data type:** String_
+
+### token
+InfluxDB [authentication token](/{{< latest "influxdb" "v2" >}}/security/tokens/).
+
+_**Data type:** String_
+
+### start
+The earliest time to include when calculating cardinality.
+The cardinality calculation **includes** points that match the specified start time.
+Use a relative duration or absolute time.
+For example, `-1h` or `2019-08-28T22:00:00Z`.
+Durations are relative to [`now()`](/influxdb/v2.0/reference/flux/stdlib/built-in/misc/now/).
+
+_**Data type:** Duration | Time_
+
+### stop
+The latest time to include when calculating cardinality.
+The cardinality calculation **excludes** points that match the specified start time.
+Use a relative duration or absolute time.
+For example, `-1h` or `2019-08-28T22:00:00Z`.
+Durations are relative to [`now()`](/influxdb/v2.0/reference/flux/stdlib/built-in/misc/now/).
+Defaults to `now()`.
+
+_**Data type:** Duration | Time_
+
+### predicate
+Predicate function that filters records.
+_Defaults to `(r) => true`._
+
+_**Data type:** Function_
+
+## Examples
+
+##### Query series cardinality in a bucket
+```js
+import "influxdata/influxdb"
+
+influxdb.cardinality(
+  bucket: "example-bucket"
+  start: -1y,
+)
+```
+
+##### Query series cardinality in a measurement
+```js
+import "influxdata/influxdb"
+
+influxdb.cardinality(
+  bucket: "example-bucket"
+  start: -1y,
+  predicate: (r) => r._measurement == "example-measurement"
+)
+```
+
+##### Query series cardinality for a specific tag
+```js
+import "influxdata/influxdb"
+
+influxdb.cardinality(
+  bucket: "example-bucket"
+  start: -1y,
+  predicate: (r) => r.exampleTag == "foo"
+)
+```

content/influxdb/v2.0/reference/glossary.md

@@ -825,13 +825,13 @@ Related entries: [field set](#field-set), [measurement](#measurement),<!-- [rete
 
 ### series cardinality
 
-The number of unique bucket, measurement, tag set, and field key combinations in an InfluxDB instance.
+The number of unique measurement, tag set, and field key combinations in an InfluxDB bucket.
 
-For example, assume that an InfluxDB instance has a single bucket and one measurement.
+For example, assume that an InfluxDB bucket has one measurement.
 The single measurement has two tag keys: `email` and `status`.
 If there are three different `email`s, and each email address is associated with two
 different `status`es, the series cardinality for the measurement is 6
-(3 * 2 = 6):
+(3 × 2 = 6):
 
 | email                 | status |
 | :-------------------- | :----- |
@@ -842,11 +842,11 @@ different `status`es, the series cardinality for the measurement is 6
 | cliff@influxdata.com  | start  |
 | cliff@influxdata.com  | finish |
 
-In some cases, performing this multiplication may overestimate series cardinality because of the presence of dependent tags.
-Dependent tags are scoped by another tag and do not increase series
-cardinality.
+In some cases, performing this multiplication may overestimate series cardinality
+because of the presence of dependent tags.
+Dependent tags are scoped by another tag and do not increase series cardinality.
 If we add the tag `firstname` to the example above, the series cardinality
-would not be 18 (3 * 2 * 3 = 18).
+would not be 18 (3 × 2 × 3 = 18).
 The series cardinality would remain unchanged at 6, as `firstname` is already scoped by the `email` tag:
 
 | email                | status | firstname |
@@ -858,7 +858,9 @@ The series cardinality would remain unchanged at 6, as `firstname` is already sc
 | cliff@influxdata.com | start  | clifford  |
 | cliff@influxdata.com | finish | clifford  |
 
-<!--See [SHOW CARDINALITY](/{{< latest "influxdb" "v1" >}}/query_language/spec/#show-cardinality) to learn about the InfluxQL commands for series cardinality. -->
+##### Query for cardinality:
+- **Flux:** [influxdb.cardinality()](/influxdb/v2.0/reference/flux/stdlib/influxdb/cardinality/)
+- **InfluxQL:** [SHOW CARDINALITY](/{{< latest "influxdb" "v1" >}}/query_language/spec/#show-cardinality)
 
 Related entries: [field key](#field-key),[measurement](#measurement), [tag key](#tag-key), [tag set](#tag-set)
 

content/influxdb/v2.0/reference/release-notes/flux.md

@@ -8,6 +8,28 @@ menu:
     name: Flux
 ---
 
+## v0.93.0 [2020-11-02]
+
+### Features
+- Ensure query plan nodes have unique IDs.
+
+---
+
+## v0.92.0 [2020-10-30]
+
+### Features
+- Add `fluxinit` package as an alternative to importing `builtin`.
+- Add [series `cardinality()` function](/influxdb/v2.0/reference/flux/stdlib/influxdb/cardinality/) to InfluxDB package.
+
+### Bug fixes
+- Do not panic when the value column for `pivot()` does not exist.
+- Properly truncate timestamps to beginning of window bounds.
+- Updates operator precedence in formatter.
+- Do not panic when a string expression evaluates to _null_.
+- Add support for multiline conditional logic.
+
+---
+
 ## v0.91.0 [2020-10-26]
 
 ### Features