Use grafana provisioning to replace dashboard installer

[qiffang]

Function
In the higher version of grafana,. it improve the experience by adding a new active provisioning system that uses config files. So we can remove dashboard installer logic by the feature.
But there is a problem the file of dashboard is too large exceed the limitation of ConfigMap's annotation field, we have to compress it by gzip.
The logic is here:

1. Make a ConfigMap which contains dashboard file named monitor-dashboard-configmap.yaml
   The content is binary data
2. Make a ConfigMap which contains dasource file and dashboard provisioning file(This file declare a dashboard path), the name of file is monitor-configmap.yaml
3. Update monitor-deployment file, the spec declare the ConfigMaps to the directory specified
4. Add a poststart logic to decompress the files to the path which dashboard provisioning declare
   postStart: exec: command: - "/bin/sh" - "-c" - > gzip -dc /tmp/dashboard-gz/tidb.json.gz > /grafana-dashboard-definitions/tidb/tidb.json; gzip -dc /tmp/dashboard-gz/pd.json.gz > /grafana-dashboard-definitions/tidb/pd.json; gzip -dc /tmp/dashboard-gz/tikv.json.gz > /grafana-dashboard-definitions/tidb/tikv.json; gzip -dc /tmp/dashboard-gz/overview.json.gz > /grafana-dashboard-definitions/tidb/overview.json;
5. Delete the dashboad installer content

Test

1. There is not the Job pod to install dashboard and datasource by API
2. The dashboard works well
   

[tennix]

There should be some documents about how the zipped dashboards come from, so other contributors know how to update it when there are newer dashboards in the upstream.

[aylei]

Good job! I just left a format suggestion and a question.

[aylei]

Keep a new line at the end of file, so do the rest files

[qiffang]

Accept

[qiffang]

There should be some documents about how the zipped dashboards come from, so other contributors know how to update it when there are newer dashboards in the upstream.

Accept

1. Add description in monitor-dashboard-configmap.yaml file.
2. Delete invalid graphs from TIDB-Cluster-Overview dashboard("System Info" and "Services Port Status") and expanded pd relation graphs in overview dashboard.
   3 . Will create another PR to push these dashboard files to tidb-docker-compose repository.

[tennix]

LGTM

[xiaojingchen]

why not build an image which contains the config file, avoid to save config files to the configmap?

[tennix]

why not build an image which contains the config file, avoid to save config files to the configmap?

@xiaojingchen It's more convient to use configmap instead of a static docker image, especially when the dashboards needs to be updated.

[weekface]

use && instead of ;?

[weekface]

@qiffang

[weekface]

lgtm