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.

• Name: Tarun Pothulapati
• Github: pothulapati
• Email: [email protected]
• Blog: www.tarunpothulapati.com
• Mentor: Thomas Rampelberg

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.

• SMI-Metrics with Istio

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

• Istio Support

Repository: smi-metrics

Total Pull Requests Created: 14

1. deislabs/smi-metrics#37 - Move Queries struct to a common package.
2. deislabs/smi-metrics#36 - Single version Variable for both charts and docker images
3. deislabs/smi-metrics#31 - Release automation through CircleCI
4. deislabs/smi-metrics#30 - smi metrics istio installation through helm
5. deislabs/smi-metrics#25 - Istio Support for SMI-Metrics
6. deislabs/smi-metrics#23 - Mesh Interface and Refactoring
7. deislabs/smi-metrics#19 - Fix unused dependencies using go mod tidy
8. deislabs/smi-metrics#13 - Add usage docs
9. deislabs/smi-metrics#11 - Added CircleCI Config
10. deislabs/smi-metrics#7 - Reading Queries from Config yaml
11. deislabs/smi-metrics#5 - Remove NetRC dependency as the repo's are public

Total Issues Opened: 11

1. deislabs/smi-metrics#28 - Add Tests for Istio pkg
2. deislabs/smi-metrics#27 - Update Istio docs with configuration options through helm
3. deislabs/smi-metrics#26 - Template response latency queries.
4. deislabs/smi-metrics#24 - Move prometheus related code out of linkerd
5. deislabs/smi-metrics#22 - Service shouldnt 404 on / endpoint
6. deislabs/smi-metrics#20 - Fix make build
7. deislabs/smi-metrics#18 - ApiService dosen't run on 1.15
8. deislabs/smi-metrics#9 - More documentation on the SMI APIService
9. deislabs/smi-metrics#8 - Negative Values in the latency metrics.
10. deislabs/smi-metrics#4 - Support Metrics from Istio
11. deislabs/smi-metrics#3 - Making Queries Configurable

Total Pull Requests Reviewed: 2

1. deislabs/smi-metrics#35 - Match circle's arcane filters pattern
2. deislabs/smi-metrics#33 - Update release tooling to trigger off a tag

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

• Traffic Splitting in Linkerd

Repository: linkerd2 Total Pull Requests Created: 18

1. linkerd/linkerd2#3194 - Check for Namespace level config override annotations
2. linkerd/linkerd2#3193 - Setting SuccessfulJobHistoryLimit to 0 for CronJobs
3. linkerd/linkerd2#3153 - replace extensions/v1beta1 to apps/v1beta1
4. linkerd/linkerd2#3152 - Add Node Selectors to select only linux nodes
5. linkerd/linkerd2#3092 - Added Resource Limits when ha is Configured
6. linkerd/linkerd2#3038 - Fix inject with path and add tests
7. linkerd/linkerd2#2988 - linkerd inject from remote URL
8. linkerd/linkerd2#2984 - add admin port label to proxy-injector and sp-validator
9. linkerd/linkerd2#2963 - Add sideEffects field to Webhooks
10. linkerd/linkerd2#2893 - Added Anti Affinity when HA is configured
11. linkerd/linkerd2#2874 - HA for proxy-injector and sp-validator
12. linkerd/linkerd2#2853 - Added labels to webhook configurations in charts/
13. linkerd/linkerd2#2820 - Added controller component labels to webhook configurations
14. linkerd/linkerd2#2439 - Added Jobs Resource to Linkerd Dashboard along with grafana.
15. linkerd/linkerd2#2416 - WIP: Wire up stats and dashboards for Jobs
16. linkerd/linkerd2#2387 - WIP: Wire up stats and dashboards for Jobs
17. linkerd/linkerd2#2293 - Added ep Alias for endpoints command
18. linkerd/linkerd2#2292 - Ignoring resources with empty kind field.

Total Pull Requests Reviewed: 3

1. linkerd/linkerd2#3266 - Fix integration test
2. linkerd/linkerd2#3039 - Fix linkerd inject url handling
3. linkerd/linkerd2#3032 - Add release notes for stable-2.4.0

Repository: rfc

Total Pull Requests Created: 1

1. linkerd/rfc#3 - Obsevarbility through GraphQL

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