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Update grafana & prometheus docker images (#8 )

### Motivation

As seen below, there is a fix for one of the Grafana dashboards that are currently broken in this project (available since version 0.0.5):
- [The Pulsar-topics metrics can't load in Grafana](https://github.com/streamnative/charts/issues/49)

Additionally, upgrading Prometheus to the latest version improves performance as seen here: https://prometheus.io/blog/2017/11/08/announcing-prometheus-2-0

### Modifications

Bring Docker images to their most up-to-date version (streamnative/apache-pulsar-grafana-dashboard-k8s:0.0.6, prom/prometheus:v2.17.2) to fix the following issues:
- https://github.com/streamnative/charts/issues/49 <- fixes Pulsar-topics metrics failure to load
- https://github.com/prometheus/prometheus/pull/2859 <- prevent escalation vulnerabilities by defaulting to the ```nobody``` user

**Note**: upgrading to the latest version of Prometheus (currently v2.17.2) caused the pod to fail with the following error: ```open /prometheus/queries.active: permission denied```. In order to fix this issue I followed the instructions from these 2 comments:

- [Permission denied UID/GID solution](https://github.com/prometheus/prometheus/issues/5976#issuecomment-532942295)
- [Unable to create mmap-ed active query log securityContext fix](https://github.com/aws/eks-charts/issues/21#issuecomment-607031756)

### Verifying this change

- [x] Make sure that the change passes the CI checks.

2020-04-29 01:25:32 -07:00

.ci

Publish chart index to gh-pages branch (#3 )

2020-04-21 02:44:58 -07:00

.github

Publish chart index to gh-pages branch (#3 )

2020-04-21 02:44:58 -07:00

charts/pulsar

Update grafana & prometheus docker images (#8 )

2020-04-29 01:25:32 -07:00

examples

Improve Helm chart (#6673 )