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https://github.com/pothulapati/gsoc-meta-linkerd

Repo regarding my Google Summer of Code 2019 Internship with Linkerd
https://github.com/pothulapati/gsoc-meta-linkerd

cncf graphql linkerd observability servicemesh

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Repo regarding my Google Summer of Code 2019 Internship with Linkerd

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# Google Summer of Code 2019 Internship with Linkerd



My GSoC work was aimed to contribute to the SMI-Metrics repository i.e to add support for Istio and also work on other Issues. As the SMI-Metrics project was pretty new, to keep up my work and not get struck on one thing, I also contributed to the Linkerd project i.e fixing issues, adding more features, etc.



## General Info



+ Name: Tarun Pothulapati

+ Github: [pothulapati](www.github.com/pothulapati)

+ Email: tarunpothulapati@outlook.com

+ Blog: www.tarunpothulapati.com

+ Mentor: Thomas Rampelberg



## Contributions to SMI-Metrics



Intially the SMI-Metrics, had a very hard dependency on prometheus for metrics as it was still a prototype. This can be a challenge for service mesh projects that don’t depend on prometheus for queries or had a drastically different structure of time-series (i.e labels, sum of multiple metrics,etc ). So, I worked on adding a Mesh Interface and de-coupling the prometheus client. This made the repo more extensiable i.e now service meshes can just implement the interface and reply those metrics with or without prometheus.



### Blog Posts



+ [SMI-Metrics with Istio](https://www.tarunpothulapati.com/posts/my-gsoc-journey-with-linkerd/)



*The above blog post consists of a demo of SMI-Metrics with Istio support that I worked on.*



### Design Docs



+ [Istio Support](https://docs.google.com/document/d/1mOlmwjLjoR1dus8G68ChYxJ_TJLBBvIdbYdGacFbeNM/edit?usp=sharing)



### Code Contributions



**Repository: smi-metrics**



Total Pull Requests Created: 14



1. [deislabs/smi-metrics#37](https://github.com/deislabs/smi-metrics/pull/37) - Move Queries struct to a common package.

2. [deislabs/smi-metrics#36](https://github.com/deislabs/smi-metrics/pull/36) - Single version Variable for both charts and  docker images

3. [deislabs/smi-metrics#31](https://github.com/deislabs/smi-metrics/pull/31) - Release automation through CircleCI

4. [deislabs/smi-metrics#30](https://github.com/deislabs/smi-metrics/pull/30) - smi metrics istio installation through helm

5. [deislabs/smi-metrics#25](https://github.com/deislabs/smi-metrics/pull/25) - Istio Support for SMI-Metrics

6. [deislabs/smi-metrics#23](https://github.com/deislabs/smi-metrics/pull/23) - Mesh Interface and Refactoring

7. [deislabs/smi-metrics#19](https://github.com/deislabs/smi-metrics/pull/19) - Fix unused dependencies using go mod tidy

8. [deislabs/smi-metrics#13](https://github.com/deislabs/smi-metrics/pull/13) - Add usage docs

9. [deislabs/smi-metrics#11](https://github.com/deislabs/smi-metrics/pull/11) - Added CircleCI Config

10. [deislabs/smi-metrics#7](https://github.com/deislabs/smi-metrics/pull/7) - Reading Queries from Config yaml

11. [deislabs/smi-metrics#5](https://github.com/deislabs/smi-metrics/pull/5) - Remove NetRC dependency as the repo's are public



Total Issues Opened: 11



1. [deislabs/smi-metrics#28](https://github.com/deislabs/smi-metrics/issues/28) - Add Tests for Istio pkg

2. [deislabs/smi-metrics#27](https://github.com/deislabs/smi-metrics/issues/27) - Update Istio docs with configuration options through helm

3. [deislabs/smi-metrics#26](https://github.com/deislabs/smi-metrics/issues/26) - Template response latency queries.

4. [deislabs/smi-metrics#24](https://github.com/deislabs/smi-metrics/issues/24) - Move prometheus related code out of linkerd

5. [deislabs/smi-metrics#22](https://github.com/deislabs/smi-metrics/issues/22) - Service shouldnt 404 on `/` endpoint

6. [deislabs/smi-metrics#20](https://github.com/deislabs/smi-metrics/issues/20) - Fix make build

7. [deislabs/smi-metrics#18](https://github.com/deislabs/smi-metrics/issues/18) - ApiService dosen't run on 1.15

8. [deislabs/smi-metrics#9](https://github.com/deislabs/smi-metrics/issues/9) - More documentation on the SMI APIService

9. [deislabs/smi-metrics#8](https://github.com/deislabs/smi-metrics/issues/8) - Negative Values in the latency metrics.

10. [deislabs/smi-metrics#4](https://github.com/deislabs/smi-metrics/issues/4) - Support Metrics from Istio

11. [deislabs/smi-metrics#3](https://github.com/deislabs/smi-metrics/issues/3) - Making Queries Configurable



Total Pull Requests Reviewed: 2



1. [deislabs/smi-metrics#35](https://github.com/deislabs/smi-metrics/pull/35) - Match circle's arcane filters pattern

2. [deislabs/smi-metrics#33](https://github.com/deislabs/smi-metrics/pull/33) - Update release tooling to trigger off a tag



## Contributions to Linkerd



Throughout the GSoC period, I also kept my contributions up to Linkerd solving issues ranging from small bug fixes to small scale features.



### Blog Posts



- [Traffic Splitting in Linkerd](https://www.tarunpothulapati.com/posts/traffic-splitting-linkerd/)



**Repository: linkerd2**

Total Pull Requests Created: 18



1. [linkerd/linkerd2#3194](https://github.com/linkerd/linkerd2/pull/3194) - Check for Namespace level config override annotations

2. [linkerd/linkerd2#3193](https://github.com/linkerd/linkerd2/pull/3193) - Setting SuccessfulJobHistoryLimit to 0 for CronJobs

3. [linkerd/linkerd2#3153](https://github.com/linkerd/linkerd2/pull/3153) - replace extensions/v1beta1 to apps/v1beta1

4. [linkerd/linkerd2#3152](https://github.com/linkerd/linkerd2/pull/3152) - Add Node Selectors to select only linux nodes

5. [linkerd/linkerd2#3092](https://github.com/linkerd/linkerd2/pull/3092) - Added Resource Limits when ha is Configured

6. [linkerd/linkerd2#3038](https://github.com/linkerd/linkerd2/pull/3038) - Fix inject with path and add tests

7. [linkerd/linkerd2#2988](https://github.com/linkerd/linkerd2/pull/2988) - linkerd inject from remote URL

8. [linkerd/linkerd2#2984](https://github.com/linkerd/linkerd2/pull/2984) - add admin port label to proxy-injector and sp-validator

9. [linkerd/linkerd2#2963](https://github.com/linkerd/linkerd2/pull/2963) - Add sideEffects field to Webhooks

10. [linkerd/linkerd2#2893](https://github.com/linkerd/linkerd2/pull/2893) - Added Anti Affinity when HA is configured

11. [linkerd/linkerd2#2874](https://github.com/linkerd/linkerd2/pull/2874) - HA for proxy-injector and sp-validator

12. [linkerd/linkerd2#2853](https://github.com/linkerd/linkerd2/pull/2853) - Added labels to webhook configurations in charts/

13. [linkerd/linkerd2#2820](https://github.com/linkerd/linkerd2/pull/2820) - Added controller component labels to webhook configurations

14. [linkerd/linkerd2#2439](https://github.com/linkerd/linkerd2/pull/2439) - Added Jobs Resource to Linkerd Dashboard along with grafana.

15. [linkerd/linkerd2#2416](https://github.com/linkerd/linkerd2/pull/2416) - WIP: Wire up stats and dashboards for Jobs

16. [linkerd/linkerd2#2387](https://github.com/linkerd/linkerd2/pull/2387) - WIP: Wire up stats and dashboards for Jobs

17. [linkerd/linkerd2#2293](https://github.com/linkerd/linkerd2/pull/2293) - Added ep Alias for endpoints command

18. [linkerd/linkerd2#2292](https://github.com/linkerd/linkerd2/pull/2292) - Ignoring resources with empty kind field.



Total Pull Requests Reviewed: 3



1. [linkerd/linkerd2#3266](https://github.com/linkerd/linkerd2/pull/3266) - Fix integration test

2. [linkerd/linkerd2#3039](https://github.com/linkerd/linkerd2/pull/3039) - Fix linkerd inject url handling

3. [linkerd/linkerd2#3032](https://github.com/linkerd/linkerd2/pull/3032) - Add release notes for stable-2.4.0



**Repository: rfc**



Total Pull Requests Created: 1



1. [linkerd/rfc#3](https://github.com/linkerd/rfc/pull/3) - Obsevarbility through GraphQL



## Conclusion



I had a great time working with the Linkerd team and especially Thomas (my mentor). I got the oppurtunity to work on latest cutting edge technologies like Kubernetes, etc.



More information on my Google Summer of Code experience can be found [here](https://www.tarunpothulapati.com/posts/my-gsoc-journey-with-linkerd/)