.github: simplify the telemetry proposal template

Reduce the telemetry proposal template to make it easier to file
telemetry proposals. At a high level, the proposal is just a request to
merge a specific configuration change, so a free text rationale as well
as proposed CL link should suffice. The proposal committee can make sure
that all concerns about new uploading are addressed.

Also, fix links to the chartconfig package documentation, as well as the
config.txt file, and reference the new go.dev/doc/telemetry.

Change-Id: I9eefba14967a18327abfcb2de427dc4bec6d659f
Reviewed-on: https://go-review.googlesource.com/c/go/+/583496
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Robert Findley <rfindley@google.com>
Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>

.github/ISSUE_TEMPLATE/12-telemetry.yml

@@ -1,68 +1,33 @@
 name: Go Telemetry Proposals
-description: New telemetry counter or update on an existing one
+description: |
+  Modify the telemetry upload configuration, by adding new counters to upload,
+  or refining or removing existing upload configuration.
 title: "x/telemetry/config: proposal title"
 labels: ["Telemetry-Proposal"]
 projects: ["golang/29"]
 body:
 - type: textarea
   attributes:
-    label: Counter names
+    label: Summary
-    description: Names of counters to add or update.
-  validations:
-    required: true
-- type: textarea
-  attributes:
-    label: Description
-    description: What do these counters measure?
-  validations:
-    required: true
-- type: textarea
-  attributes:
-    label: Rationale
     description: |
-      Why is the counter important?
+      What change are you proposing to the upload configuration, and why?
-      For example, what new insights will it provide, and how will that information be used?
+      For new upload configuration, which new counters will be collected, what
-      If this is about updating existing counters, why is the change necessary?
+      do they measure, and why is it important to collect them?
+      All counters must already be instrumented in the target program.
+      Note that uploaded data must not carry sensitive user information.
+      See [go.dev/doc/telemetry#proposals](https://go.dev/doc/telemetry#proposals)
+      for more details on telemetry proposals.
   validations:
     required: true
-- type: textarea
+- type: input
   attributes:
-    label: Do the counters carry sensitive user information?
+    label: Proposed Config Change
-  validations:
-    required: true
-- type: textarea
-  attributes:
-    label: How?
     description: |
-      How do we plan to compute the info?
+      A CL containing proposed changes to the
-      If available, include the code location or cl that uses the golang.org/x/telemetry/counter API.
+      [config.txt](https://go.googlesource.com/telemetry/+/master/internal/chartconfig/config.txt)
+      chart configuration.
+      See the [chartconfig](https://pkg.go.dev/golang.org/x/telemetry/internal/chartconfig)
+      package for an explanation of the chart config format.
+      For an example change, see [CL 564619](https://go.dev/cl/564619).
   validations:
     required: true
-- type: textarea
-  attributes:
-    label: Proposed Graph Config
-    description: |
-      Approved telemetry counters are maintained as [Go Telemetry Graph Config](https://golang.org/x/telemetry/internal/graphconfig) records.
-      Please draft the record entry for your proposal here.
-      If multiple records need to be included, separate them with `---` lines.
-      You can check the list of the approved counters and their current configuration in [config.txt](https://go.googlesource.com/telemetry/+/master/internal/configgen/config.txt).
-    render: Text
-    value: |
-      counter: gopls/bug
-      title: Gopls bug reports
-      description: Stacks of bugs encountered on the gopls server.
-      type: partition, histogram, stack # choose only one.
-      program: golang.org/x/tools/gopls
-      counter: gopls/bug
-      depth: 16  # only if type is stack.
-      version: v0.13.0  # the first binary version containing this counter.
-  validations:
-      required: true
-- type: dropdown
-  attributes:
-    label: New or Update
-    description: Is this a new counter? See [config.txt](https://go.googlesource.com/telemetry/+/master/internal/configgen/config.txt) for the list of approved counters.
-    options:
-      - New
-      - Update
-    default: 0