feat(dockerstats): add online cpu and memory failcnt metrics (open-te…

…lemetry#31481)

**Description:** two new metrics have been added, they were already
being scraped but not emitted

**Link to tracking Issue:** open-telemetry#31366

**Testing:** added new metrics to `TestScrapeV2` 

**Documentation:** generated by mdatagen

.chloggen/dockerstats-onlinecpus-failcnt.yaml

@@ -0,0 +1,27 @@
+# Use this changelog template to create an entry for release notes.
+
+# One of 'breaking', 'deprecation', 'new_component', 'enhancement', 'bug_fix'
+change_type: enhancement
+
+# The name of the component, or a single word describing the area of concern, (e.g. filelogreceiver)
+component: dockerstatsreceiver
+
+# A brief description of the change. Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: add metrics for online CPU count and memory fails count
+
+# Mandatory: One or more tracking issues related to the change. You can use the PR number here if no issue exists.
+issues: [31366]
+
+# (Optional) One or more lines of additional information to render under the primary note.
+# These lines will be padded with 2 spaces and then inserted directly into the document.
+# Use pipe (|) for multiline entries.
+subtext:
+
+# If your change doesn't affect end users or the exported elements of any package,
+# you should instead start your pull request title with [chore] or use the "Skip Changelog" label.
+# Optional: The change log or logs in which this entry should be included.
+# e.g. '[user]' or '[user, api]'
+# Include 'user' if the change is relevant to end users.
+# Include 'api' if there is a change to a library API.
+# Default: '[user]'
+change_logs: [user]

receiver/dockerstatsreceiver/documentation.md

@@ -306,6 +306,14 @@ This metric is only reported if the container has limits set with -cpus, -cpuset
 | ---- | ----------- | ---------- |
 | {cpus} | Gauge | Double |
 
+### container.cpu.logical.count
+
+Number of cores available to the container.
+
+| Unit | Metric Type | Value Type |
+| ---- | ----------- | ---------- |
+| {cpus} | Gauge | Int |
+
 ### container.cpu.shares
 
 CPU shares set for the container.
@@ -406,6 +414,14 @@ Bytes that are waiting to get written back to the disk, from this cgroup (Only a
 | ---- | ----------- | ---------- | ----------------------- | --------- |
 | By | Sum | Int | Cumulative | false |
 
+### container.memory.fails
+
+Number of times the memory limit was hit.
+
+| Unit | Metric Type | Value Type | Aggregation Temporality | Monotonic |
+| ---- | ----------- | ---------- | ----------------------- | --------- |
+| {fails} | Sum | Int | Cumulative | true |
+
 ### container.memory.hierarchical_memory_limit
 
 The maximum amount of physical memory that can be used by the processes of this control group (Only available with cgroups v1).