feat(grafana json): update grafana json for nginx shared dict in prometheus

[ccxhwmy]

update grafana json for nginx shared dict in prometheus

Description

update grafana json to add nginx shared dict, which default config is internal-status|upstream-healthcheck|worker-events|lrucache-lock|balancer-ewma|balancer-ewma-locks|balancer-ewma-last-touched-at|etcd-cluster-health-check.

Fixes # (issue)

Checklist

• I have explained the need for this PR and the problem it solves
• I have explained the changes or the new features added to this PR
• I have added tests corresponding to this change
• I have updated the documentation to reflect this change
• I have verified that this change is backward compatible (If not, please discuss on the APISIX mailing list first)

[soulbird]

We can't see the change of apisix_shared_dict_free_space_bytes through the ordinate, can you adjust the unit? That would be more intuitive. Please note that we cannot determine the size of the shared memory in the actual environment, it may be 1MB or 100MB, so pay attention to the generality of the unit.

[spacewander]

If you are worried about showing instances will make the graph too complex, maybe we can add a comment that people can modify this query to show per-instance graph?

We can't add comment to a JSON file.

[ccxhwmy]

If you are worried about showing instances will make the graph too complex, maybe we can add a comment that people can modify this query to show per-instance graph?

Does you mean add a comment like # we can modify the expr to show per-instance graph in json file?

[spacewander]

Anyway, LGTM