bump river to v0.3.0 (#5621)

Closes #5615

CHANGELOG.md

@@ -42,7 +42,15 @@ Main (unreleased)
 - Added a new `stage.eventlogmessage` stage to `loki.process` component which
   allows to extract data from Windows Event Log. (@thampiotr)
 
-- Update version of River to support raw strings in flow using a backtick. (@erikbaranowski)
+- Update version of River:
+
+    - River now supports raw strings, which are strings surrounded by backticks
+      instead of double quotes. Raw strings can span multiple lines, and do not
+      support any escape sequences. (@erikbaranowski)
+
+    - River now permits using `[]` to access non-existent keys in an object.
+      When this is done, the access evaluates to `null`, such that `{}["foo"]
+      == null` is true. (@rfratto)
 
 - Added support for python profiling to `pyroscope.ebpf` component. (@korniltsev)
 
@@ -63,10 +71,13 @@ Main (unreleased)
 - Fix validation issue with ServiceMonitors when scrape timeout is greater than interval. (@captncraig)
 
 - Static mode's spanmetrics processor will now prune histograms when the dimension cache is pruned.
-  Dimension cache was always pruned but histograms were not being pruned. This caused metric series 
+  Dimension cache was always pruned but histograms were not being pruned. This caused metric series
   created by the spanmetrics processor to grow unbounded. Only static mode has this issue. Flow mode's
   `otelcol.connector.spanmetrics` does not have this bug. (@nijave)
 
+- Fixed a bug in River where passing a non-string key to an object (such as
+  `{}[true]`) would incorrectly report that a number type was expected instead. (@rfratto)
+
 ### Enhancements
 
 - The `loki.write` WAL now has snappy compression enabled by default. (@thepalbi)
@@ -78,7 +89,7 @@ Main (unreleased)
 - The `loki.source.docker` component now allows connecting to Docker daemons
   over HTTP(S) and setting up TLS credentials. (@tpaschalis)
 
-- Added an `add_metric_suffixes` option to `otelcol.exporter.prometheus` in flow mode, 
+- Added an `add_metric_suffixes` option to `otelcol.exporter.prometheus` in flow mode,
   which configures whether to add type and unit suffixes to metrics names. (@mar4uk)
 
 v0.37.3 (2023-10-26)
@@ -102,9 +113,9 @@ v0.37.3 (2023-10-26)
 
 - Upgrade OpenTelemetry Collector packages to version 0.87 (@ptodev):
   - `otelcol.receiver.kafka` has a new `header_extraction` block to extract headers from Kafka records.
-  - `otelcol.receiver.kafka` has a new `version` argument to change the version of 
+  - `otelcol.receiver.kafka` has a new `version` argument to change the version of
     the SASL Protocol for SASL authentication.
-  
+
 v0.37.2 (2023-10-16)
 -----------------
 

docs/sources/flow/config-language/expressions/operators.md

@@ -115,3 +115,9 @@ arr[1]
 obj.app
 local.file.token.content
 ```
+
+If the `[ ]` operator is used to access a member of an object where the member
+doesn't exist, the resulting value is `null`.
+
+If the `.` operator is used to access a named member of an object where the
+named member doesn't exist, an error is generated.

go.mod

@@ -61,7 +61,7 @@ require (
 	github.com/grafana/pyroscope/api v0.2.0
 	github.com/grafana/pyroscope/ebpf v0.3.0
 	github.com/grafana/regexp v0.0.0-20221123153739-15dc172cd2db
-	github.com/grafana/river v0.2.0
+	github.com/grafana/river v0.3.0
 	github.com/grafana/snowflake-prometheus-exporter v0.0.0-20221213150626-862cad8e9538
 	github.com/grafana/tail v0.0.0-20230510142333-77b18831edf0
 	github.com/grafana/vmware_exporter v0.0.4-beta

go.sum

@@ -1080,8 +1080,8 @@ github.com/grafana/pyroscope/ebpf v0.3.0 h1:7J24qd5ul786ZNDpgN8oIDbuBEXX2L829BjN
 github.com/grafana/pyroscope/ebpf v0.3.0/go.mod h1:f9gfqjtpxYs/1t7L2HskrR5kQMH64gclaCYdtZ1unKo=
 github.com/grafana/regexp v0.0.0-20221123153739-15dc172cd2db h1:7aN5cccjIqCLTzedH7MZzRZt5/lsAHch6Z3L2ZGn5FA=
 github.com/grafana/regexp v0.0.0-20221123153739-15dc172cd2db/go.mod h1:M5qHK+eWfAv8VR/265dIuEpL3fNfeC21tXXp9itM24A=
-github.com/grafana/river v0.2.0 h1:VgBe/+DdYviJ1cYGUCcA8Og0FhSTjN7jdHCe/+OIFV0=
-github.com/grafana/river v0.2.0/go.mod h1:icSidCSHYXJUYy6TjGAi/D+X7FsP7Gc7cxvBUIwYMmY=
+github.com/grafana/river v0.3.0 h1:6TsaR/vkkcppUM9I0muGbPIUedCtpPu6OWreE5+CE6g=
+github.com/grafana/river v0.3.0/go.mod h1:icSidCSHYXJUYy6TjGAi/D+X7FsP7Gc7cxvBUIwYMmY=
 github.com/grafana/smimesign v0.2.1-0.20220408144937-2a5adf3481d3 h1:UPkAxuhlAcRmJT3/qd34OMTl+ZU7BLLfOO2+NXBlJpY=
 github.com/grafana/smimesign v0.2.1-0.20220408144937-2a5adf3481d3/go.mod h1:iZiiwNT4HbtGRVqCQu7uJPEZCuEE5sfSSttcnePkDl4=
 github.com/grafana/snowflake-prometheus-exporter v0.0.0-20221213150626-862cad8e9538 h1:tkT0yha3JzB5S5VNjfY4lT0cJAe20pU8XGt3Nuq73rM=