### Internal

* 🔧 Configure strict pytest options and update/refactor tests. Upgrade pytest to `>=6.2.4,<7.0.0` and pytest-cov to `>=2.12.0,<3.0.0`. Initial PR [#2790](https://github.com/tiangolo/fastapi/pull/2790) by [@graingert](https://github.com/graingert).

  - go_memory_classes_heap_stacks_bytes
  - go_memory_classes_heap_unused_bytes
  - go_memory_classes_metadata_mcache_free_bytes
  - go_memory_classes_metadata_mcache_inuse_bytes
  - go_memory_classes_metadata_mspan_free_bytes
  - go_memory_classes_metadata_mspan_inuse_bytes
  - go_memory_classes_metadata_other_bytes
  - go_memory_classes_os_stacks_bytes
  - go_memory_classes_other_bytes

  - `container_cpu_usage_seconds_total`
  - `container_memory_working_set_bytes`
  - `container_start_time_seconds`
  - `node_cpu_usage_seconds_total`
  - `node_memory_working_set_bytes`
  - `pod_cpu_usage_seconds_total`
  - `pod_memory_working_set_bytes`
  - `resource_scrape_error`
  

<ol>
<li>
Converting a slice of bytes to a string type yields
a string whose successive bytes are the elements of the slice.

<pre>
string([]byte{'h', 'e', 'l', 'l', '\xc3', '\xb8'})   // "hellø"
string([]byte{})                                     // ""
string([]byte(nil))                                  // ""

type bytes []byte
string(bytes{'h', 'e', 'l', 'l', '\xc3', '\xb8'})    // "hellø"

  // The log output is limited to 2048 bytes or 80 lines, whichever is smaller.
  // Defaults to File.
  // Cannot be updated.
  // +optional
  optional string terminationMessagePolicy = 20;

  // Image pull policy.
  // One of Always, Never, IfNotPresent.
  // Defaults to Always if :latest tag is specified, or IfNotPresent otherwise.
  // Cannot be updated.