Add Kebechet metrics class and cli option

[xtuchyna]

Related Issues and Dependencies

This is a split of #323 with only the kebechet metrics part.
Related PRs:

• Create Kebechet update manager statistics (daily) on Ceph #331
• Create SLI/SLO to monitor the use of each Kebechet Manager kebechet#546

This introduces a breaking change

• Yes
• No

This Pull Request implements

Kebechet stats for repository. Use option -K or --kebechet with cli to launch.

Description

Stats preview:
path: ./srcopsmetrics/metrics/thoth-station/mi/kebechet_update_manager_2021-02-18.json
data:

{
    "results": {
        "overall": {
            "created_pull_requests": 151,
            "rejected": 11,
            "rejected_by_kebechet_bot": 3,
            "rejected_by_other": 8,
            "merged": 140,
            "merged_by_kebechet_bot": 68,
            "merged_by_other": 72
        },
        "daily": {
            "created_pull_requests": 0,
            "rejected": 0,
            "rejected_by_kebechet_bot": 0,
            "rejected_by_other": 0,
            "merged": 0,
            "merged_by_kebechet_bot": 0,
            "merged_by_other": 0
        }
    }
}

[todo]

include stats of reviewers?

mi/srcopsmetrics/kebechet_metrics.py

Lines 125 to 130 in 1ee561b

	# TODO: include stats of reviewers?
	# reviewers = [pr["reviews"][r]["author"] for r in pr["reviews"]]
	review_times = [int(pr["reviews"][r]["submitted_at"]) for r in pr["reviews"]]
	ttfr = min(review_times) - created_at if review_times else None
	reviews = [r for r in pr["reviews"].values()]

---

This comment was generated by todo based on a TODO comment in 1ee561b in #332. cc @xtuchyna.

[pacospace]

/hold

[todo]

consider adding median_time to every day statistics (rolling windown maybe?)

mi/srcopsmetrics/kebechet_metrics.py

Lines 191 to 196 in 577ba97

	# TODO consider adding median_time to every day statistics (rolling windown maybe?)
	if self.today:
	median_time = prs[prs["days"] == today]["ttm"].median()
	day["median_ttm"] = median_time if not np.isnan(median_time) else 0
	return day

---

This comment was generated by todo based on a TODO comment in 577ba97 in #332. cc @xtuchyna.

[xtuchyna]

Everything in mi regarding the issue should be done, last bits remain to mi-scheduler ( thoth-station/mi-scheduler#76 )

[pacospace]

LGTM 💯

[sesheta]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: pacospace

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[xtuchyna]

/unhold

[xtuchyna]

/retest