cleanup: delete gas-oracle

The `gas-oracle` service was responsible to managing
the congestion fees of the legacy system. It is no longer
used and can be deleted.

.circleci/config.yml

@@ -1257,10 +1257,6 @@ workflows:
           name: proxyd-tests
           binary_name: proxyd
           working_directory: proxyd
-      - go-lint-test-build:
-          name: gas-oracle-tests
-          binary_name: gas-oracle
-          working_directory: gas-oracle
       - go-lint-test-build:
           name: indexer-tests
           binary_name: indexer

.github/CODEOWNERS

@@ -1,5 +1,4 @@
 # Legacy codebases
-/gas-oracle                     @ethereum-optimism/legacy-reviewers
 /l2geth                         @ethereum-optimism/legacy-reviewers
 /packages/actor-tests           @ethereum-optimism/legacy-reviewers
 /packages/common-ts             @ethereum-optimism/typescript-reviewers

.github/workflows/publish-canary.yml

@@ -24,7 +24,6 @@ jobs:
       data-transport-layer: ${{ steps.packages.outputs.data-transport-layer }}
       contracts: ${{ steps.packages.outputs.contracts }}
       contracts-bedrock: ${{ steps.packages.outputs.contracts-bedrock }}
-      gas-oracle: ${{ steps.packages.outputs.gas-oracle }}
       replica-healthcheck: ${{ steps.packages.outputs.replica-healthcheck }}
       hardhat-node: ${{ steps.packages.outputs.hardhat-node }}
       canary-docker-tag: ${{ steps.docker-image-name.outputs.canary-docker-tag }}
@@ -124,32 +123,6 @@ jobs:
           push: true
           tags: ethereumoptimism/l2geth:${{ needs.canary-publish.outputs.canary-docker-tag }}
 
-  gas-oracle:
-    name: Publish Gas Oracle ${{ needs.canary-publish.outputs.canary-docker-tag }}
-    needs: canary-publish
-    if: needs.canary-publish.outputs.gas-oracle != ''
-    runs-on: ubuntu-latest
-
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v2
-      - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v1
-
-      - name: Login to Docker Hub
-        uses: docker/login-action@v1
-        with:
-          username: ${{ secrets.DOCKERHUB_ACCESS_TOKEN_USERNAME }}
-          password: ${{ secrets.DOCKERHUB_ACCESS_TOKEN_SECRET }}
-
-      - name: Build and push
-        uses: docker/build-push-action@v2
-        with:
-          context: .
-          file: ./gas-oracle/Dockerfile
-          push: true
-          tags: ethereumoptimism/gas-oracle:${{ needs.canary-publish.outputs.canary-docker-tag }}
-
   hardhat-node:
     name: Publish Hardhat Node ${{ needs.canary-publish.outputs.canary-docker-tag }}
     needs: canary-publish

.github/workflows/release.yml

@@ -24,7 +24,6 @@ jobs:
       contracts: ${{ steps.packages.outputs.contracts }}
       contracts-bedrock: ${{ steps.packages.outputs.contracts-bedrock }}
       balance-monitor: ${{ steps.packages.outputs.balance-monitor }}
-      gas-oracle: ${{ steps.packages.outputs.gas-oracle }}
       replica-healthcheck: ${{ steps.packages.outputs.replica-healthcheck }}
       hardhat-node: ${{ steps.packages.outputs.hardhat-node }}
       op-exporter: ${{ steps.packages.outputs.op-exporter }}
@@ -110,32 +109,6 @@ jobs:
           push: true
           tags: ethereumoptimism/l2geth:${{ needs.release.outputs.l2geth }},ethereumoptimism/l2geth:latest
 
-  gas-oracle:
-    name: Publish Gas Oracle Version ${{ needs.release.outputs.gas-oracle }}
-    needs: release
-    if: needs.release.outputs.gas-oracle != ''
-    runs-on: ubuntu-latest
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v2
-
-      - name: Login to Docker Hub
-        uses: docker/login-action@v1
-        with:
-          username: ${{ secrets.DOCKERHUB_ACCESS_TOKEN_USERNAME }}
-          password: ${{ secrets.DOCKERHUB_ACCESS_TOKEN_SECRET }}
-
-      - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v1
-
-      - name: Publish Gas Oracle
-        uses: docker/build-push-action@v2
-        with:
-          context: .
-          file: ./gas-oracle/Dockerfile
-          push: true
-          tags: ethereumoptimism/gas-oracle:${{ needs.release.outputs.gas-oracle }},ethereumoptimism/gas-oracle:latest
-
   hardhat-node:
     name: Publish Hardhat Node ${{ needs.release.outputs.hardhat-node }}
     needs: release

README.md

@@ -90,7 +90,6 @@ Refer to the Directory Structure section below to understand which packages are
 │   ├── <a href="./packages/message-relayer">message-relayer</a>: Tool for automatically relaying L1<>L2 messages in development
 │   ├── <a href="./packages/replica-healthcheck">replica-healthcheck</a>: Service for monitoring the health of a replica node
 │   └── <a href="./packages/sdk">sdk</a>: provides a set of tools for interacting with Optimism
-├── <a href="./gas-oracle">gas-oracle</a>: Service for updating L1 gas prices on L2
 ├── <a href="./indexer">indexer</a>: indexes and syncs transactions
 ├── <a href="./infra/op-replica">infra/op-replica</a>: Deployment examples and resources for running an Optimism replica
 ├── <a href="./l2geth">l2geth</a>: Optimism client software, a fork of <a href="https://github.com/ethereum/go-ethereum/tree/v1.9.10">geth v1.9.10</a>