Session report collection and report templates

[piksel]

PoC for collecting a report containing session stats. Updated to not replace the current notification templates, but instead make the report-based notifications an opt-in (using the --notification-report flag)

---

This will generate the following report for each session:

watchtower/pkg/types/report.go

Lines 3 to 10 in c34de89

	type Report interface {
	Scanned() []ContainerReport
	Updated() []ContainerReport
	Failed() []ContainerReport
	Skipped() []ContainerReport
	Stale() []ContainerReport
	Fresh() []ContainerReport
	}

where each ContainerReport contains

watchtower/pkg/types/report.go

Lines 12 to 20 in c34de89

	type ContainerReport interface {
	ID() string
	Name() string
	OldImageID() string
	NewImageID() string
	ImageName() string
	Error() string
	State() string
	}

This report is passed to the template together with the log entries (the old template data):

watchtower/pkg/notifications/shoutrrr.go

Lines 206 to 209 in c34de89

	type Data struct {
	Entries []*log.Entry
	Report t.Report
	}

This makes it possible to send notifications like these instead of the full logs:

3 Scanned, 1 Updated
 - /baz (alpine:latest): Updated
 - /bar (nginx:latest): Fresh
 - /bar (redis:latest): Stale
Found new alpine:latest image (5de788243aca)
Stopping /baz (a9faebf599b0) with SIGTERM
Creating /baz

...using template:

{{with .Report -}}
  {{len .Scanned}} Scanned, {{len .Updated}} Updated
  {{range .Scanned}}
     - {{.Name}} ({{.ImageName}}): {{.State}}
  {{end}}
{{- end}}
{{range .Entries}}
  {{- .Message -}}
{{end}}

Note that the above still contains the old "log" notifications at the bottom as well, but the point is that you don't have to include them.

Report container classifications:

[codecov]

Codecov Report

Merging #981 (71251ea) into main (145fe6d) will increase coverage by 2.51%.
The diff coverage is 62.60%.

@@            Coverage Diff             @@
##             main     #981      +/-   ##
==========================================
+ Coverage   57.11%   59.63%   +2.51%     
==========================================
  Files          25       22       -3     
  Lines        1476     1412      -64     
==========================================
- Hits          843      842       -1     
+ Misses        564      500      -64     
- Partials       69       70       +1     

Impacted Files	Coverage Δ
pkg/notifications/email.go	90.69% <ø> (-0.22%)	⬇️
pkg/notifications/gotify.go	66.66% <ø> (-1.08%)	⬇️
pkg/notifications/msteams.go	66.66% <ø> (-1.76%)	⬇️
pkg/notifications/slack.go	100.00% <ø> (ø)
pkg/container/client.go	14.28% <8.33%> (-0.19%)	⬇️
pkg/container/container.go	45.36% <20.00%> (-1.45%)	⬇️
pkg/notifications/shoutrrr.go	75.38% <70.27%> (+1.94%)	⬆️
pkg/notifications/notifier.go	69.56% <84.61%> (+36.75%)	⬆️
internal/actions/update.go	63.55% <86.66%> (-0.24%)	⬇️
internal/flags/flags.go	88.65% <100.00%> (ø)
... and 1 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 145fe6d...71251ea. Read the comment docs.