Complete maintainers processes

MAINTAINER.md

@@ -14,13 +14,23 @@
 * Marco Jantke [@marco-jantke](https://github.com/marco-jantke)
 * Michaël Matur [@mmatur](https://github.com/mmatur)
 
+## Contributions Daily Meeting
+
+* 3 Maintainers should attend to a Contributions Daily Meeting where we sort and label new issues ([is:issue label:status/0-needs-triage](https://github.com/containous/traefik/issues?utf8=%E2%9C%93&q=is%3Aissue+label%3Astatus%2F0-needs-triage+)), and review every Pull Requests
+* Every pull request should be checked during the Contributions Daily Meeting
+   * Even if it’s already assigned
+   * Even PR labelled with `contributor/waiting-for-corrections` or `contributor/waiting-for-feedback`
+* Issues labeled with `priority/P0` and `priority/P1` should be assigned.
+* Modifying an issue (labels, assignees, milestone) is only possible during the Contributions Daily Meeting, or by an assigned maintainer
 
 ## PR review process:
 
 * The status `needs-design-review` is only used in complex/heavy/tricky PRs.
-* From `1` to `2`: 1 design LGTM in comment, by a senior maintainer, if needed.
-* From `2` to `3`: 3 LGTM by any maintainer.
+* From `status/1-needs-design-review` to `status/2-needs-review`: 1 design LGTM in comment, by a senior maintainer, if needed.
+* From `status/2-needs-review` to `status/3-needs-merge`: 3 LGTM by any maintainer.
 * If needed, a specific maintainer familiar with a particular domain can be requested for the review.
+* If a PR has been implemented in pair programming, one peer's LGTM goes into the review for free
+* Amending someone else's pull request is authorized only in emergency, if a rebase is needed, or if the initial contributor is silent
 
 We use [PRM](https://github.com/ldez/prm) to manage locally pull requests.
 
@@ -130,18 +140,20 @@ If we open/look an issue/PR, we must add a `kind/*`, an `area/*` and a `status/*
 * `area/websocket`: WebSocket related.
 * `area/webui`: Web UI related.
 
-### Priority
+### Issues Priority
 
-* `priority/P0`: needs hot fix. **(only for issue)**
-* `priority/P1`: need to be fixed in next release. **(only for issue)**
-* `priority/P2`: need to be fixed in the future. **(only for issue)**
-* `priority/P3`: maybe. **(only for issue)**
+* `priority/P0`: needs hot fix.
+* `priority/P1`: need to be fixed in next release.
+* `priority/P2`: need to be fixed in the future.
+* `priority/P3`: maybe.
 
 ### PR size
 
-* `size/S`: small PR. **(only for PR)** _[bot only]_
-* `size/M`: medium PR. **(only for PR)** _[bot only]_
-* `size/L`: Large PR. **(only for PR)** _[bot only]_
+_Automatically set by a bot_
+
+* `size/S`: small PR.
+* `size/M`: medium PR.
+* `size/L`: Large PR.
 
 ### Status - Workflow